A study of the relationship between pesticide treatment and the fauna in citrus groves on Nagashima Island, Kagoshima Prefecture.

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  • Study of the Relationship between Pesticide Treatment and the Fauna in Citrus Groves on Nagashima Island Kagoshima Prefecture

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This is our third report on the effect of agrochemical treatment to the insect and mite fauna at two native citrus groves of ‘Kuroshima-mikan’. The groves are located in Kasedo and kawatoko on the island of Nagashima, Kagoshima Prefecture. In Kasedo, spraying was practiced in 1974-85 but there was no (or no heavy) spraying from 1986-92. On the other hand in Kawatoko, which was left unsprayed until 1985, only petroleum oil was used once a year (in January) in 1986-87 and in 1990-92. In Kasedo, Panonychus citri (citrus red mite) maintained a high population until 1986, probably because of the poor fauna of its natural enemies due to the spray of insecticides. In Kawatoko, Unaspis yanonensis (arrowhead scale) dropped in numbers from 1986 due to the use of petroleum oil. Kawatoko had a rich fauna of insects, especially the effective predators and parasitoids of insect and mite pests. The use of petroleum oil in winter (once a year) was effective against scales and eventually against mites and whiteflies whose natural enemies were uninhibited by the petroleum oil.

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