|Title:||農藥引起柑桔葉蟎再崛起現象之觀察||Other Titles:||Observation on resurgence of citrus red mite, Panonychus citri (McGregor) following pesticide applications||Authors:||何坤耀
|Keywords:||柑桔葉蟎;再崛起現象;Panonychus citri (McGregor);resurgence||Issue Date:||Jun-1984||Publisher:||植病保護學會||Journal Volume:||26||Journal Issue:||2||Start page/Pages:||99-108||Source:||植物保護學會會刊||Abstract:||
The citrus red mite, Panonychus citri (McGregor) has been one of important pests of citrus since intensive use of pesticides for controlling the insect pests and diseases of this crop in the years of 1950. Destruction of natural enemies was considered as the major factor inducing severe infestation of the mite. Present study was conducted to observe the nature of mite resurgence following pesticide applications both in a wirehouse. (natural enemies free) and field conditions. The results showed that the population of the mite increased significantly following the application of insecticides, such as 85% Carbaryl W. P., 50% Methyl parathion E. C., 40.64% Furadan F., 50% Malathion E. C., 4-4 Bordeaux Mixture, 47% Ethyl parathion E. C., 50% Sumithion E. C., 44% Dimethoate E. C., and 24% Lannate S. in their recommended cncentration. Among them, Carbaryl, Methyl parathion, Furadan, and Malathion induced a more severe outbreak of the mite than the others.
Time and interval of pesticide application were the important factors affecting an outbreak of the mite. Single application of pesticide did not increase the mite population significantly. Two applications with 3 weeks interval increased the population clearly 1 week following the second spray, whereas four applications with 1 week interval induced a severe outbreak of the mite.
On the other hand, the insecticides such as Sumithion which was observed to increase a greater mite population in the field than that was tested in the wirehouse conditions. Therefore, destruction of nature enemies was also an important factor in causing a resurgence of the mite.
|Appears in Collections:||植物保護系|
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