oa African Entomology - Biology of Apion soleatum Wagner (Coleoptera: Apionidae) relative to cotton production in South Africa
This paper reports on the results of an investigation of the distribution, life cycle, effect on cotton growth and yield, as well as the feeding preferences on cotton of Apion soleaturn Wagner, the cotton stem weevil, in South Africa. Apion soleaturn was found to occur only in the eastern Transvaal and northern Natal cotton producing regions. Apion soleaturn oviposits in tissue of the cotton plant, its only known host. Larvae, of which there are three instars, and pupae develop in the stem tissue. Adults feed on the leaves, and are found predominantly near the apices of plants. The larval stages were shown to be responsible for losses in cotton yield and diminished growth of cotton plants in general. Control of this insect, should it be necessary, must be designed to minimize toxic effects on Entedon apionidis Ferriere, a parasitoid of A. soleaturn.
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