Preferred name: Monochamus scutellatus
Authority: (Say)
Taxonomic position: Animalia: Arthropoda: Hexapoda: Insecta: Coleoptera: Cerambycidae
Common names in English: white spotted sawyer
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Notes on taxonomy and nomenclature EPPO Categorization: A1 list
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EPPO Code: MONCST

White pine (Pinus strobus) appears to be the favoured host of M. scutellatus, but it also attacks many other conifers such as red pine (Pinus resinosa) and jack pine (Pinus banksiana), balsam fir (Abies balsamea), white spruce (common name for more than one species), black spruce (Picea mariana) and red spruce (Picea rubens), and larch (Larix) (Baker, 1972).

Host list: Abies balsamea, Abies, Larix laricina, Larix, Picea glauca, Picea mariana, Picea, Pinus nigra, Pinus resinosa, Pinus strobus, Pinus, Pseudotsuga menziesii, Tsuga canadensis, Tsuga heterophylla, Tsuga

M. scutellatus occurs from Newfoundland south to North Carolina, westwards to Minnesota and north- westwards to Alaska (Baker, 1972), also from British Columbia south to California and Western Nevada (Linsley & Chemsak, 1984). M. scutellatus is the most widely distributed Monochamus species in Eastern Canada (Rose, 1957).

North America: Canada (Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland, Northwest Territories, Nova Scotia, Ontario, Prince Edward Island, Québec, Saskatchewan, Yukon Territory), Mexico, United States of America (Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, Tennessee, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming)

M. scutellatus has a two-year life cycle in Canada and the US states surrounding the great lakes. Further south it has a one generation per year. Adults emerge through circular holes cut in the bark and feed for short periods on needles and tender bark of various conifers (Rose, 1957).  Adults are thought to need to have completed a first phase of feeding before they become sexually mature (Fuentealba, 2007).  Males arrive at mating sites and guard the territory until females arrive. M. scutellatus have been observed arriving at cut logs within a few hours of cutting starting (Wilson, 1962). Mating will take place repeatedly and can disrupt oviposition (Hughes & Hughes, 1985, Peddle et al., 2002). Mating generally takes place on warm sunny days, on or near the host tree (Fuentealba, 2007). Eggs are then deposited in slits or notches chewed into the bark, preferably near old branch scars or in wrinkled areas on logs, pulpwood and recently killed trees (Baker, 1972). The choice of an oviposition site within P. resinosa logs was shown to be influenced positively by diameter and negatively by outer bark thickness (Fuentealba, 2007). Females primarily make ovipositional scars and lay eggs 3-4 cm apart in field conditions (Fuentealba, 2007). Females are less inclined to lay eggs on wood that has already been used by other females. Female M. scutellatus cut more scars than are used for oviposition suggesting that they need to excavate the bark before they can fully assess the suitability of a site for egg deposition and this may relate to phloem thickness (Peddle et al., 2002). The final stage of egg laying involves the female depositing a jelly like substance over the egg with her abdomen. This substance may be to protect against desiccation, predators and parasitoids (Fuentealba, 2007).  

In the Sioux Lookout district of Ontario, M. scutellatus adults emerge during June and July. About 23 months are required for development from egg to adult. There is thought to be a gap of seven to ten days between adult emergence and mating. In this district mating has been observed to take place in the afternoon on bright sunny days and was followed almost immediately by egg laying into slits cut into the bark. Oviposition tended to occur in partial shade with most eggs laid on the lower surface or side of logs. Approximately 70% of all slits cut into the bark were empty. Slits containing eggs were almost invariably cut into small cavities in the bark that appeared to be small empty resin blisters. Over the course of a six-year study, the oviposition period varied from seven to ten weeks, but in each year, 90% of eggs were laid during a period of four to six weeks. The date of the first oviposition varied between early June and early July (Rose, 1957).

At Sioux Lookout, the egg stage lasts nine to fourteen days with a mean of twelve days. After hatching, larvae consume egg remnants and tunnel directly through the phloem to the cambium which takes two to three days. Flat mines are created in the cambium over the course of two to three weeks. Second stage larvae also feed on the cambium, widening, and extending the mines, noticeably scoring the wood surface, a phase lasting a further two to three weeks.  Cannibalism can occur if larval density is high. The third instar is reached in early September, and this is the stage that starts to tunnel into the wood, although the larvae return to surface of the wood to feed. Extrusions of excess frass can become noticeable at this time. The majority of the first-year larvae overwinter in the third instar with a minority overwintering as second and fourth instars. In the autumn, activity continues until continuous cold weather starts. Second year larvae become active as soon as the first warm weather starts. The rate of larval growth has been found to relate to the thickness of the inner bark of hosts (Fuentealba, 2007). By mid-August, most of the population are fourth instars. By mid-summer, most larvae have reached their deepest point within the wood and are starting to tunnel towards the surface, although throughout the summer the larvae also continue to feed on the surface extruding large amounts of frass. By late September, pupal chambers are constructed within 5mm of the surface of the wood and the second winter is spent in the pre-pupal stage. Pupation takes place in the third summer about two weeks before the adults emerge. The start of adult emergence can be as early as late May and as late as mid-June (Rose, 1957).  

Rose (1957) calculated that less than 2% of eggs laid on logs reached maturity. The main cause of mortality was the desiccation of eggs exposed to the sun and the second was cannibalism.  

Miller (1986) studied the impact of excluding Monochamus spp. from freshly cut bolts (sections of a logs) of Pinus taeda on other insects. The presence of Monochamus spp. significantly reduced the number of emerging Ips calligraphus (Coleoptera: Curculionidae), Platysoma cylindricum (Coleoptera: Histeridae) and Medetera bistriata (Diptera: Dolichopodidae). This demonstrates that reducing Monochamus sp. populations could lead to increased populations of other damaging species.

Dauer larvae of pine wood nematode, Bursaphelenchus xylophilus have been found in association with of M. scutellatus on Pinus nigra and Abies balsamea in Minnesota (Wingfield & Blanchette, 1983). M. scutellatus is considered to be the second most important vector of pine wood nematode in the USA after M. carolinensis (Akbulut & Stamps, 2012). Bergdahl et al. (1991) collected Monochamus sp. from two locations in Vermont and sampled them for nematodes. The proportion of beetles infested with B. xylophilus was similar for M. notatus (51%) and M. scutellatus (56%), but M. scutellatus carried many more nematodes per beetle (mean 5450) than the M. notatus (595). Blatt et al. (2019) collected Monochamus spp. from Christmas tree (Abies balsamea) plantations in Nova Scotia. B. xylophilus was recovered from the three Monochamus spp. that were caught: M. marmorator, M. notatus and M. scutellatus.

Symptoms

The following signs and symptoms may be seen in wood infested with Monochamus spp. (Wilson, 1975):

1. Slits chewed by adult female for egg laying in the bark, although only a minority of these may have eggs in them,
2. Scoring in the xylem and phloem caused by larval feeding,
3. Frass – the waste expelled by feeding larvae from trees,
4. Oval shaped holes made by larvae as they bore deeper into sap wood,
5. Circular exit holes created by adults.

Morphology

Eggs

Eggs are white and oblong with an average size of 3.0 mm long by 0.9 mm wide. 

Larvae

Young larvae are creamy white, without legs, and have an amber-brown head with a pair of short mandibles. Larvae measure up to 50 mm long and 5 mm wide at the thorax and can be found year-round inside the host plant. Pupae are white and soft like the larvae; they resemble adults (20-25 mm long). As the pupa ages, the mouthparts, legs, antennae and wings become more distinct; when fully developed, it turns brown and its exoskeleton hardens (Fuentealba, 2007). Monochamus spp. larvae can be identified using DNA barcoding, but it has not been validated for all species (EFSA, 2018).

Adults

Adults males are completely shiny black except for a small rounded white spot at the base of the elytra, females are either the same colour or have an elytra mottled with white spots (Baker, 1972).

Linsley and Chemsak (1984) provide a more detailed description of the adults:

‘Male: Form moderate-size to large; integument black, shining, often with a brassy caste, appendages often partially reddish, pubescence sparse to moderately dense, short, brownish, appressed. Head with a front convex, finely to coarsely confluently punctate, usually sparsely clothed with fine recumbent pubescence genae longer than lower eye lobe, parallel to slightly convergent; antennae extending five or six segments beyond elytra, usually twice the length of the body, segments finely, very densely aspirate, nonpubescent, segments from third or fourth with apical sensory areas. Pronotum about as broad as long, lateral tubercles strongly produced, apices blunt; apical and basal transverse impressions shallow, plicate; disk irregularly, transversely punctate at middle, center often longitudinally impressed; pubescence sparse, short, fine; prosternum glabrous to moderately pubescent; meso- and metasternum sparsely to densely clothed with long suberect hairs and often small patches of white appressed pubescence. Elytra a little more than twice as long as broad; punctures coarse, transverse, rugose appearing, becoming finer toward apex; pubescence very fine, brownish, sparse to moderately dense, often with small patches of white appressed pubescence at basal one-third; apices rounded. Scutellum apically rounded, densely white pubescent, usually with a glabrous median line. Legs finely gray pubescent. Abdomen sparsely to moderately densely pubescent; last sternite rounded to subtruncate at apex. Length 13-35 mm.

Female: Form more robust. Antennae extending two or three segments beyond elytra, segments apically broadly white annulate, not asperate. Elytra usually with scattered small patches of white appressed pubescence. Abdomen with last sternite truncate to shallowly emarginate at apex, densely tufted. Length 14-30 mm.’

Detection and inspection methods 

There is no specific information on inspections for M. scutellatus, but Monochamus spp. are attracted to weakened, dying or dead host trees. Therefore, such trees, which often have partly or completely discoloured needles, should be the focus of surveillance for Monochamus spp. Close inspection may allow the detection of oviposition slits in the bark of dead or dying trees, oval-shaped larval entrance holes in the sapwood under the dead bark, or round adult exit holes in the sapwood. Larvae can also be extracted from the bark or sapwood, and adults can be found walking or resting on cut or dead wood during the summer (EFSA, 2018). The most efficient detection method is trapping (see below).  Blatt et al. (2019) caught M. marmorator, M. notatus and M. scutellatus in traps in plantations of healthy Christmas trees (Abies balsamea) showing that there are exceptions to the general association between Monochamus spp. and weakened or dead trees.

Traps

Traps baited with lures consisting of 95% (-)-α-pinene, (±)-ipsenol and (±)-ipsdienol were attractive to M. scutellatus, but the compounds were not tested individually (de Groot & Nott, 2001). Allison et al. (2001) found that M. scutellatus was attracted to a blend of ipsenol, ipsdienol, frontalin and 3-methyl-2-cyclohexen-1-one. In a study in British Columbia, Allison et al. (2003) showed that ipsenol was superior to ipsdienol as an attractant for M. scutellatus and recommended that it should be used for mass trapping programmes.

de Groot and Nott (2004) studied the response of Monochamus spp. to pheromones in stands of jack pine (Pinus banksiana), black spruce (Picea mariana) and balsam fir (Abies balsamea) in Ontario. They found no evidence that frontalin is a kairomone for M. scutellatus or M. maculosus (synonym = M. mutator) or that ipsdienol was attractive to either species when either compound was used at release rates commonly used for bark beetles. Traps baited with ipsenol were more effective than unbaited traps at catching M. scutellatus, but not more effective than α-pinene.

In a field and laboratory study, Fierke et al. (2012) provided evidence that monochamol is a component of the pheromone produced by male M. scutellatus. 

In a large study at 16 sites across North America, Miller et al. (2013) demonstrated that multiple-funnel traps baited with a blend of ipsenol, ipsdienol, ethanol and α-pinene were attractive to the M. titillator / M. carolinensis complex, M. scutellatus, M. clamator, M. obtusus and M. maculosus. This mixture of four compounds, was more effective than unbaited traps or traps with a mixture of ipsenol and ipsdienol or traps with a mixture of ethanol and α-pinene. Ethanol is produced by stressed conifer trees and α-pinene is a constituent of the oleoresin of most pine species.  Ipsenol and ipsdienol occur naturally in pine forests (Miller et al., 2013).

Ryall et al. (2015) provided evidence that monochamol is attractive to M. scutellatus, M. notatus and M. carolinensis which supported evidence from previous studies (e.g Fierke et al. (2012); Allison et al. (2012)) The studies also demonstrated a synergism between monochamol and host volatiles. (Allison et al., 2012) showed that monochamol is attractive to M. titillator as well as to traps baited with (2R*,3R*)-2,3-hexanediol plus -pinene (but not to traps baited with (2R*,3R*)-2,3-hexanediol alone). There is evidence showing that monochamol is attractive to 12 Monochamus species and so it has excellent potential for surveys of beetles of the Genus (Ryall et al., 2015).

Miller et al. (2016) tested the efficacy of different combinations of α-pinene, monochamol and ipsenol for catching Monochamus spp. in two Canadian provinces and eight states in the USA. The study provided evidence of the beneficial effect of including both monochamol and ipsenol in lures. Monochamol did not increase catches of other Cerambycidae, bark beetles, other weevils or bark beetle predators.

Boone et al. (2019) tested the efficacy of teflon-coated cross-vane traps with four lures monochamol: 2 mg/day; ipsenol: 2.5 mg/day, 2-methyl-3-buten-1-ol: 10 mg/day; and α-pinene: 500 mg/day. Large numbers of M. carolinensis, M. maculosus, M. notatus, M. scutellatus, M. clamator, and M. titillator were trapped in North America, while large numbers of M. alternatus were trapped in China. This result demonstrated that such traps could be used for the detection of non-native Monochamus spp. in Europe.

There is no specific information on the pathways for M. scutellatus and so the following information is generic to the genus. Monochamus spp. can naturally disperse by flight. A number of dispersal studies have been carried out with Monochamus spp.  For example, Monochamus alternatus adult were shown to be able to disperse 3.3 km from infested logs to diseased trees (Kobayashi et al., 1984). In a mark-recapture experiment in Spain, Monochamus galloprovincialis (Olivier) flew a maximum of 22.1 km with around 2% of beetles flying further than 3 km (Mas et al., 2013).

Safranyik and Raske (1970) devised a sequential sampling plan to determine the damage caused by Monochamus spp. larvae to timber. The plan was based on a study in Alberta in which lodgepole pine (Pinus contorta) logs were sampled for M. scutellatus, M. maculosus and M. notatus. The method involved counting larval entrance holes into the logs any time after September following the summer of attack. At densities of greater than 2.5 holes / ft² (approx. 30cm x 30cm), there was a 30% loss in value of the timber.

Pinewood nematode, which is vectored by Monochamus spp. has been found to be able to spread at a mean rate of 5.3 km per year in Portugal (de la Fuente et al., 2018), 6 km / year in Japan (Togashi & Shigesada, 2006) and an estimated 7.5 km / year in China (Robinet et al., 2009). However, long distance man assisted spread of pine wood nematode can occur over much larger distances with a mean annual dispersal of 111-339 km estimated in China (Robinet et al., 2009). Monochamus spp. can be spread in coniferous wood and coniferous wood packaging material, dunnage, particle wood and waste conifer wood, hitchhiking and in finished wood products (EFSA, 2018, Ostojá-Starzewski, 2014). Between 1998 and 2018 there were 124 interception records of Monochamus sp. on wood packaging material in the EU (EFSA, 2018). Between 1984 and 2018, there were 42 interceptions of Monochamus spp. on wood packaging material in the USA which were identified to species level: M. alternatus (17), M. carolinensis (Oliver) (2), M. clamator (Leconte) (1), M. galloprovincialis (Oliver) (5), M. sartor (Fabricius) (5), M. scutellatus (Say) (2), M. sutor (Linnaeus) (9) and M. teserula White (1) (Eyre & Haack, 2017). Monochamus spp. females lay their eggs in various parts of their trees, including smaller branches down to 2 cm in diameter. Plants for planting are considered to be an unlikely pathway for the spread of Monochamus spp. because they tend to attack weakened or dead trees and weakened trees are unlikely to be traded (EFSA 2018).  However, the trapping of Monochamus spp. in plantations of healthy Christmas trees (Abies balsamea) suggests there would be some risk in importing host trees from North America into the EPPO region (Blatt et al., 2019).

Economic impact

M. scutellatus emerged from timber in a newly built home at Mount Pearl, Newfoundland, Canada (CAIPR, 1967-1983). M. scutellatus can cause economic losses to the forest industry by damaging freshly cut trees during harvesting and at woodyards (Wilson, 1962). M. notatus, M. marmorator and M. scutellatus have been trapped in Christmas tree plantations in Nova Scotia (Blatt et al., 2017).

Safranyik and Raske (1970) devised a sequential sampling plan to determine the damage caused by Monochamus spp. larvae to timber. The plan was based on a study in Alberta in which lodgepole pine (Pinus contorta) logs were sampled for M. scutellatus, M. maculosus and M. notatus. The method involved counting larval entrance holes into the logs any time after September following the summer of attack. At densities of greater than 2.5 holes / ft² (approx. 30cm x 30cm), there was a 30% loss in value of the timber. 

Monochamus are not considered to be plant pests in their own right because they do not tend to attack healthy trees however, they can and damage and can facilitate the introduction and spread of pine wood nematode in Europe (EFSA, 2018). Monochamus spp. rarely, if ever, attack vigorously growing trees (Gibson, 2010). However, the impact from Monochamus spp. in the USA is high, largely due to the export restrictions of forestry products associated with pine wood nematode, Bursaphelenchus xylophilus (Miller et al., 2013). In the USA, Monochamus spp. larvae, are also responsible for extensive damage to fire damaged, dying, recently killed, and felled conifers of various species—but especially pines, spruce, true firs, and Douglas-fir. M. scutellatus causes heavy losses to sawlogs and pulpwood in northern states of the USA and Southern Canada (Baker, 1972). The larvae damage infested trees and logs through series of extensive mines that introduce decay-causing fungi (Baker, 1972, Gibson, 2010). Wood chips harvested from wood infested by Monochamus species can be too small for use at pulp mills (Wilson, 1962).

Control

Wilson (1962) studied attacks by wood boring insects on stacks of felled balsam fir, Abies balsamea in Minnesota. M. scutellatus was the most frequently observed cerambycid beetle, accounting for c. 90-95% of all beetles observed. M. notatus and M. marmorator were also occasionally observed. Piles of wood placed in full shade suffered less damage than wood exposed to the sun.  Also, standard piles with less wood exposed to beetle damage suffered less damage than piles stacked in ‘pens’ with wood stacked in open perpendicular layers. The average volume of wood lost from standard piles of wood over two years in the sun ranged from 0.47% of interior logs to 2.64% for exterior logs and for piles in the shade from 0.37% for interior logs to 0.59 % for exterior logs.  Damage to felled wood can be reduced by: i) transporting wood as soon as possible after felling; ii) placing wood in the shade of other trees; ii) covering wood in a layer of 45 cm of slash iv) stacking wood in standard piles to reduce the area exposed to beetle attacks; v) removing bark from felled wood; vi) immersing logs in water; vii) applying insecticides to exposed wood (Wilson, 1962, Wilson, 1975). Monochamus damage can be prevented by not exposing wood during the July-September egg laying period and minimized by processing any infested wood as soon as possible (Gibson, 2010).  

The following ichneumonids are natural enemies of M. scutellatus: Rhyssa persuasoria (L.) and Rhyssa lineolata (Kby.) as well as the following tachinids: Eutheresia monohammi Townsend and Eutheresia tirvittata Curran; the following entomopathogenic fungi: Beauveria tenella and Beauveria bassiana and the entomopathogenic nematode genus: Hecamermis sp. (Linsley & Chemsak, 1984).

Phytosanitary risk

The introduction of non-native Monochamus spp. into Europe could introduce pine wood nematode to new locations and hosts and enhance the rate of spread of the pest. Pinewood nematode has causes severe damage to forests in East Asia and in Europe and the impacts are likely to increase (EFSA, 2018). M. scutellatus is known to be an important vector of B. xylophilus in North America (Akbulut & Stamps, 2012).

The EU has emergency measures to prevent the spread of pinewood nematode within the union (EU, 2012). These measures include demarcating areas, destruction of contaminated material, heat treatment of wood and wood products, hygiene protocols for forestry vehicles and transport conditions for plants, wood and bark (EFSA, 2018). Measures to reduce the risk of wood becoming infested during transit include: not transporting wood through infested areas; not transporting wood during the flight season or covering the wood during transit. Debarking of harvested wood can also reduce risks from Monochamus spp. (EFSA, 2018).

Recommended phytosanitary measures to reduce the risk of the introduction and spread of non-European Monochamus spp. and pinewood nematode are set out in the EPPO commodity standard for Coniferae, PM 8/2 (3).  For example, there are recommendations by host species to reduce the risk of introducing pinewood nematode or its Monochamus sp. vectors on wood, such as pest free areas, treatment of wood and conditions for the transport of the wood (EPPO, 2018).

The treatment of wood according to ISPM 15 will reduce the risk of the introduction of xylophagous pests such as Monochamus spp. and pine wood nematode being introduced to previously uninfested areas in wood packaging material, although treatments are not always applied effectively (Haack et al., 2014).

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This datasheet was prepared in 2022 by Dominic Eyre (Defra, GB). His valuable contribution is gratefully acknowledged.

EPPO (2024) Monochamus scutellatus. EPPO datasheets on pests recommended for regulation. https://gd.eppo.int (accessed 2024-04-20)

This datasheet was first published online in 2022. It is maintained in an electronic format in the EPPO Global Database. The sections on 'Identity', ‘Hosts’, and 'Geographical distribution' are automatically updated from the database. For other sections, the date of last revision is indicated on the right.