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(農業試驗所特刊第10號)Biological Control of Citrus, Vegetables And Tobacco Aphids
No full textAphids in subtropical countries apparently take anholocycle year round. The loss caused by aphid transmitted virus is much greater than direct infestation by aphids. This report presents 8 major aphids of citrus, vegetables and tobacco. Their parasites and predators were also surveyed.
The parasites such as Aphidius gifuensis, Ephedrus persicae, Aphelinus sp. of green peach aphid and Trioxys colimunis of cotton aphid have already been introduced to the United States. The most active predators in checking aphid population are Lgmnia swinhoei in citrus groves, Coccine!la seplempunctata bruckil and Menochilus sexmaculatus in cruciferous vegetable fields. Hoverflies are uncertain due to different species occurring in different seasons, while predacious activity of aphis-lions is inferior to coccinellids and hoverflies.
Citrus black aphid, Toxopera citricida is a major citrus aphid which is toxic to most species of coccinellids and all species of aphis, lions except Lemnia sw!nhoei, L. biplagiata, Propylaea jajtonica, Coelophora chinensis and Scymnus spp. However, many species of hoverflies are unaffected. Turnip aphid, Lip2phis erysmi is toxic to the larvae of the above 2 species of Lemnia but it is not harmful to other aphid-feeding coccinellids. Consequently, using indigenous predators or parasites for biological control of citrus and vegetables aphids would not be successful in Taiwan.
The systemic insecticide, Azodrin WSC was shown to be a good chemical for bark treatment of citrus. The painting began at the start of the growth flush and repeated 7-10 days later. It is not only used to control young foliage insects such as aphids, leaf miner, whiteflies, jumping plant lice, mealy bugs, soft scales, armored scales, stink bugs and red mite, but also to reduce citrus dogs infestation. Bark treatment instead of spraying could also preserve the natural enemies of citrus insects and avoid the side effect of the citrus mite problem
(Special Publication of TARI No.08)Bibliography Of Entomology in Taiwan, Supplement I (1957-1966)
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Importation and establishment of Tetrastichus brontispae, a parasitoid of the coconut beetle in Taiwan
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