By Michael R. Wagner
E-book through Wagner, Michael R., Cobbinah, J.R.
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Extra info for Forest entomology in West Tropical Africa: Forest insects of Ghana
Sample text
Some sucking insects, such as aphids, may disseminate plant diseases. Generally, however, the effect of sucking insects upon trees is much less conspicuous than the effect of defoliators. The few exceptions will be treated in this chapter. Sap feeders belong to two orders: Hemiptera (Heteroptera) and Homoptera. With the exception of members of one family (Miridae), which are very serious pests on the forest crop cacao (Theobroma cacao Linnaeus), Hemipterans seldom occur in sufficient numbers to be serious pests of forest trees.
14. Maurilia arcuata (Lepidoptera: Noctuidae), a defoliator of various trees in Ghana. 15. Streblote vesta (wing span 7 em) (Lepidoptera: Lasiocampidae), a defoliator of Cupresus macrocarpa on the campus of the University of Science and Technology, Kumasi . 16. 8 em). 17. 5 em. in length) . These beetles feed on Chlorophora excelsa and C. regia in nursery and transplant beds. Lepi dept era: Geometri dae Lepidoptera: Lymantri idae Lepidoptera: Sphi ngi dae Lepidoptera: Arcti idae Dasychira ~ Cell enette Dei 1ephi 1a neri i Li nneaus Oiacrisia attrayi Roths.
23 24 Outbreaks of defoliating insects It can be generally stated that extensive outbreaks of defoliating insects are uncommon in the high forests of Ghana. This is true because the forests have a high degree of species diversity and most insects have a narrow host range. A few species of tree, like wawa, occur naturally in single species clumps and will be subjected to periodic outbreaks of defoliators. When, however, single species plantations are established, the probability of an outbreak of a defoliating insect increases substantially.