Document Type : Pest Management
Author
South Kerman Agricultural and Natural Resources Research and Education Center, AREEO, Jiroft
Abstract
Citrus psylla (Diaphorina citri) is one of the most important citrus pests in the tropical regions of the world. In the first part, the experiment was carried out based on Randomized Complete Block Design (RCBD) with 5 treatments including thiacloprid (OD24%), spirotetramat (SC10%), imidacloprid (SC 35%) and control in 4 replications. In the second part, the effect of the mentioned insecticides on the mortality of adult and pupa and parasitism rate of Tamarixia radiata was investigated. The results showed, in 3 days after spraying, imidacloprid (0.75 and 1 ml/L) had the greatest effect on Asian citrus psyllid (71.56 and 69.4% first stage and 78.2 and 70.32% second stage). In 7 days after spraying, spirotetramat and thiacloprid (0.75 ml/L) were the most effective treatment with 70.11 and 68.32% mortality. The toxicity of imidacloprid on parasitoid adults was more than 80%, which based on IOBC, it was placed in the third group moderated harm. Thiacloprid and spirotetramat had less than 70% toxicity and were placed in the second group slightly harm. The Emergence percentage of adults from pupa exposed to spirotetramat was more than 90% (group a) and thiacloprid about 80% (group b). The highest parasitism percentage of parasitoid was occurred in control (90.1%) and then in spirotetramat (0.5 and 0.75 ml/L) 85.4 and 81.9% respectively. Overall, this study showed that experimental insecticides can effect on the mortality of T. radiata adults and also the emergence percentage of adults from treated pupa and the parasitism rate of these insects.
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