FABI Events

FABI in a nutshell

Research Features

Wood and bark borers comprise some of the most serious pests of forestry trees worldwide. These insects use the inside of bark and / or the wood to feed on and to make a home. Damage by these insects includes under bark girdling, extensive tunneling which weakens the tree, and / or the introduction of symbiotic fungi that weaken or kill the host. Although some wood boring beetles (such as Apate indistincta and Sinoxylon bellicosum) have been reported as minor pests of A. mearnsii, the current major wood and bark boring pests infest Eucalyptus and Pinus.

Wood borers of eucalypts

The cossid moth (Coryphodema tristis) is a major pest of Eucalyptus. This insect is reported to be native to South Africa with a wide range of native and introduced host plants, including grape vines (Vitis vinifera), quince (Cydonia oblonga) and bushwillows (Combretum sp.). It was first recorded infesting Eucalyptus in 2004. Strangely, despite its broad host range, the cossid moth has only been reported to infest E. nitens. No other Eucalyptus species has been infested, even when planted adjacent to highly infested E. nitens stands. The adult female cossid moth lays her eggs under the branches or in bark cracks. Emerging larvae first feed under the bark, but later instars bore into the sapwood. This insect is gregarious (feeds in groups) and causes extensive tunneling. Characteristic symptoms include large amounts of frass protruding from holes in the trunk, sawdust at the base of the trunk and a blackening of the trunk. The moths are also known as goat moths because of the unpleasant smell associated with their infestations. Trees often survive infestation by more than one generation of the cossid moth. But, in time trees weakened by the extensive tunneling are likely to be blown over by the wind. The tunneling also affects the quality and volume of the wood. The cossid moth has been reported to infest trees four years and older (Gebeyehu et al. 2004).

The Eucalyptus longhorn beetles (Phorocantha recurva and P. semipunctata) were accidentally introduced from Australia, and first recorded in South Africa in 1906. The adult female lays eggs under loose bark and the emerging larvae feed on the cambium and phloem layers. Fully grown larvae bore directly into the heartwood where they later pupate. The tunneling of the larvae can cause under bark girdling and reduce the value of the timber. However, these beetles are currently not considered major pests as they primarily infest dying trees.

Wood borers of pine

The Sirex woodwasp (Sirex noctilio) is one of the most serious pests of Pinus in South Africa (Hurley et al. 2008). This insect is native to Eurasia, but has been accidentally introduced to various southern hemisphere countries, and more recently to North America. In South Africa, the Sirex woodwasp was first detected in 1994 in Cape Town. It has since spread to the majority of pine growing areas in the country. The Sirex woodwasp has a symbiotic association with a fungus (Amylostereum areolatum). The adult female wasp places this fungus, together with its eggs and a toxic mucous, into the wood of pine trees. The fungus and mucous together overcome the defense of the tree and block the tracheids and thus nutrient transport. Attack by this insect usually results in tree death. Trees that survive the attack are usually attacked again the next year and killed. Importantly, the Sirex woodwasp primarily attacks stressed trees. Consequently, the most severe damage of this insect has been reported in areas where trees are stressed by factors such as drought and high stocking. The larvae tunnel in the wood, feeding on the fungus. Pupation occurs in the wood. The adult wasps do not feed and only live for one to two weeks.

The ambrosia beetles (Xyleborus and Xyleborinus spp.) also bore into the wood of Pinus. Unlike the Sirex woodwasp, these beetles are considered a minor pest. Infestations are often associated with cut or burnt trees. The beetles have a symbiotic association with fungi. The tunnels of these beetles and the staining of the wood from the fungi can make infested trees unsuitable for use as saw timber. Both the larvae and adults feed on the fungi.

Bark borers of pine

There are three species of bark beetles that are recorded to infest Pinus in South Africa. All three of these species have been accidentally introduced from the northern hemisphere. Bark beetles are considered as some of the most serious pest threats to forestry worldwide, but fortunately the three species currently in South Africa are only minor pests.

The Mediterranean pine engraver beetle (Orthotomicus erosus) feeds on the inner bark, generally on the main trunk. It attacks dead and dying trees, and can accelerate the death of dying trees by under bark girdling. It is also know to be associated with the fungus Ophiostoma ips that causes bluestain of the wood, thus decreasing its value as saw timber. The adults are dark brown and about 3 mm long. The pine bark beetle (Hylastes angustatus) feeds on the roots and stumps of dying trees. It is generally considered a secondary pest, although it has been known to kill seedlings by feeding on their roots and root-collars, thereby causing under bark girdling. In such cases, the pine bark beetle can become a serious pest. The adults are dark brown and about 4 mm long. The red-haired bark beetle (Hylurgus ligniperda) infests stumps or the base of weakened trees. The adults are dark brown and about 6 mm long (Tribe 1992).

Another bark borer on Pinus is the deodar weevil (Pissodes nemorensis). This insect breeds in dead or dying trees, but also infests the leaders of young healthy trees. The adult beetle lays its eggs under the bark and the larvae feed on the inner bark. When feeding occurs on the leaders of young trees, the leader is often killed from under bark girdling. This results in double leaders and malformation of the tree. It has been observed that such double leaders are more susceptible to infestation by the Sirex woodwasp. Pupation occurs in a chip-cocoon under the bark. Emerging adults are about 7 mm long with two creamy-white spots on their elytra (hind wings) (Gebeyehu and Wingfield 2003).

New Publications

Katumanyane A, Slippers B, Wondafrash M, Malan AP, Hurley BP. (2023) Mechanisms behind differential white grub host susceptibility to entomopathogenic nematodes. Nematology 10.1163/15685411-bja10253
Suzuki H, Marincowitz S, Rodas CA, Wingfield BD, Wingfield MJ. (2023) First report of two Chrysoporthe species, Chrysoporthe doradensis and Chrysoporthe colombiana sp. nov. from Henriettea seemannii pathogenic to Eucalyptus in Colombia. Mycological Progress 22(44) 10.1007/s11557-023-01891-8
Si H, Su Y, Wang Y, Bose T, Chang RL. (2023) The effects of co‑culture on the expression of selected PKS genes in the lichenized fungus Xanthoparmelia taractica. Mycological Progress 22:41. 10.1007/s11557-023-01894-5
Hough B, Steenkamp ET, Wingfield B, Read DA. (2023) Fungal viruses unveiled: A comprehensive review of Mycoviruses. Viruses 15(5):1202. 10.3390/v15051202 PDF
Paap T, Santini A, Rodas CA, Granados GM, Pecori F, Wingfield MJ. (2023) Myrtus communis in Europe threatened by the pandemic and South African strains of the myrtle rust pathogen Austropuccinia psidii (Sphaerophragmiaceae, Pucciniales). NeoBiota 84:41-46. 10.3897/neobiota.84.95823 PDF
Liu QL, Wingfield MJ, Duong TA, Wingfield BD. (2023) Leaf blight in a Eucalyptus plantation caused by Calonectria spp. originating from both leaves and soils. Research Square 10.21203/rs.3.rs-2529138/v1
Wilson AM, Wingfield MJ, Wingfield BD. (2023) Structure and number of mating pheromone genes is closely linked to sexual reproductive strategy in Huntiella. BMC Genomics 24:261. 10.1186/s12864-023-09355-9 PDF
Pal E, Allison JD, Hurley BP, Slippers B, Fourie G. (2023) Life History Traits of the Pentatomidae (Hemiptera) for the Development of Pest Management Tools. Forests 14(5) 10.3390/ f14050861 PDF
Nel WJ, Slippers B, Wingfield MJ, Yilmaz N, Hurley BP. (2023) Efficacy of commercially available Entomopathogenic agents against the Polyphagous Shot Hole Borer in South Africa. Insects 14(4) 10.3390/insects14040361
Jankowiak R, Gumulak N, Bilański P, Solheim H, Tomalak M, Wingfield MJ. (2023) Five new Graphium species from hardwood trees in Poland. Mycologia 10.1080/00275514.2023.2186676
Paap T, Nndanduleni M, Wingfield MJ. (2023) A critically endangered Proteaceae in the Cape Floristic Region threatened by an invasive pathogen. Bothalia 53(1):a6. 10.38201/btha.abc.v53.i1.6 PDF
Si H, Wang Y, Liu Y, Li S, Bose T, Chang RL. (2023) Fungal diversity associated with 38 lichen species revealed a new Genus of Endolichenic fungi, Intumescentia gen. nov. (Teratosphaeriaceae). Journal of Fungi 9(4):423. 10.3390/jof9040423
Guignard Q, Johannes Spaethe, Bernard Slippers, Natasa Nikolic, Jeremy D. Allison. (2023) Eye morphology and colour preferences in a semi-field test of the pine pest, Sirex noctilio (Hymenoptera: Siricidae). African Entomology 31 10.17159/2254-8854/2023/a13406 PDF
Aylward J, Ngubane NP, Dreyer LL, Oberlander K, Wingfield MJ, Roets F. (2023) Convergent evolution unites the population genetics of Protea-associated ophiostomatoid fungi. Fungal Ecology 63:101242. 10.1016/j.funeco.2023.101242
Tarigan M, Pham NQ, Jami F, Oliveira LSS, Saha MA, Duran A, Wingfield MJ. (2023) Calonectria species diversity on eucalypts in Indonesia. Southern Forests: a Journal of Forest Science 10.2989/20702620.2023.2179441
Aylward J, Roets F, Dreyer LL, Wingfield MJ. (2023) Unseen fungal biodiversity and complex inter-organismal interactions in Protea flower heads. Fungal Biology Reviews 45:100317. 10.1016/j.fbr.2023.100317
Bose T, Hammerbacher A, Jones W, Roux J, Slippers B, Wingfield MJ. (2023) Hybrid vigor in Eucalyptus increases resistance against Phytophthora root rot. Mycological Progress 22:24. 10.1007/s11557-023-01877-6
Migliorini D, Auger-Rozenberg M-A, Battisti A, Brockerhoff E, Eschen R, Fan J-t, Jactel H, Orazio C, Paap T, Prospero S, Ren L, Kenis M, Roques A, Santini A. (2023) Towards a global sentinel plants research strategy to prevent new introductions of non-native pests and pathogens in forests. The experience of HOMED. Research Ideas and Outcomes 9:e96744. 10.3897/rio.9.e96744
Katumanyane A, Slippers B, Wondafrash M, Malan AP, Hurley BP. (2023) Susceptibility of white grubs from forestry and sugarcane plantations in South Africa to entomopathogenic nematodes. BioControl 10.1007/s10526-023-10185-7
Meinecke CD, de Vos L, Yilmaz N, Steenkamp ET, Wingfield MJ, Wingfield BD. (2023) A LAMP assay for rapid detection of th epitch canker pathogen Fusarium circinatum. Plant Disease 10.1094/PDIS-04-22-0972-SR
Raffa KF, Brockerhoff EG, Grégoire JC, Hamelin RC, Liebhold AM, Santini A, Venette RC, Wingfield MJ. (2023) Approaches to forecasting damage by invasive forest insects and pathogens: A cross-assessment. BioScience (biac108) 10.1093/biosci/biac108
Teshome DT, Zharare GE, Ployet R, Naidoo S. (2023) Transcriptional reprogramming during recovery from drought stress in Eucalyptus grandis. Tree Physiology 10.1093/treephys/tpad022
Luki-Marie Scheepers, Jeremy D. Allison, Bernard Slippers, Egmont R. Rohwer, Patrick M. Mc Millan, Jan E. Bello. (2023) Pine Emperor moths from KwaZulu-Natal use the same pheromone component previously isolated from Nudaurelia cytherea (Lepidoptera: Saturniidae) from the Western Cape. African Entomology 31((2023)):1-9. 10.17159/2254-8854/2023/a13231
Mesarich CH, Barnes I, Bradley EL, de la Rosa S, de Wit PJGM, Gou Y, Griffiths SA, Hamelin RC, Joosten MHAJ, Lu M, McCarthy HM, Schol CR, Stergiopoulos I, Tarallo M, Zaccaron AZ, Bradshaw RE. (2023) Beyond the genomes of Fulvia fulva (syn. Cladosporium fulvum) and Dothistroma septosporum: New insights into how these fungal pathogens interact with their host plants. Molecular Plant Pathology 24(5):474-494. 10.1111/mpp.13309
Liang XY, Wang QC, Chen SF. (2023) Phylogeny, Morphology, Distribution, and Pathogenicity of Seven Calonectria Species from Leaf Blighted Eucalyptus in HaiNai Island, China. Plant Disease https://doi.org/10.1094/PDIS-12-22-2802-RE PDF
Liu Y, Chen SF. (2023) Diversity and Distribution of Calonectria Species in Soils from Eucalyptus urophylla × E. grandis, Pinus massoniana, and Cunninghamia lanceolata Plantations in Four Provinces in Southern China. Journal of Fungi 9(2):198. 10.3390/jof9020198 PDF
Makunde PT, Slippers B, Bush SJ, Hurley BP. (2023) Biology of the invasive shell lerp psyllid, Spondyliaspis cf. plicatuloides (Froggatt) (Hemiptera: Aphalaridae). African Entomology 31( e13747) 10.17159/2254-8854/2023/a13747 PDF
Eshetu FB, Barnes I, Nahrung FH, Fitza KNE, Meurisse N, Slippers B. (2023) Unexpected diversity in historical biological control programs: Population genetics of the nematode Deladenus siricidicola in Australia and New Zealand. Biological Control 180:105183. 10.1016/j.biocontrol.2023.105183
Morgan SW, Read DA, Burger JT, Pietersen G. (2023) Diversity of viroids infecting grapevines in the South African Vitis germplasm collection. Virus Genes 10.1007/s11262-023-01971-7
Suzuki H, Marincowitz S, Roux J, Wingfield BD, Wingfield MJ. (2023) First report of canker caused by Chrysoporthe austroafricana on the plantation-grown eucalypt Corymbia henryi in South Africa. Forestry :1-9. 10.1093/forestry/cpac054