تأثير المبيدات الحشرية في أكاروسات التفاح النباتية و المفترس

الملخص EN

The impact of some pesticides used to control insects in apple orchards was studied during the period 2010-2012.

Six insecticides (Deflubenzuron, Chlorpyrifos, Acetamiprid, Dimethoate, Esfanvelerate, Alphacypermethrin) were tested and compared with an untreated control.

Significant differences were found between insecticides according to their effect on the two apple spider mites (Tetranychus urticae and Panonychus ulmi).

In mid-June 2010 the number of spider mites was significantly lower in the Chlorpyrifos treatment (5.25 individuals/leaf), and the same result was obtained in 2011 (1.58 individuals/leaf).

Spider mite numbers were significantly the highest in response to the Dimethoate treatment (28.2 individuals/leaf) in 2010 study.

Alphacypermethrin treatment produced significantly the highest number (5.25 individual/leaf) in the 2011 study.

In 2012 study, the number of spider mites were significantly lower in untreated control (19.88 individual/leaf) and it was significantly higher in the Acetamiprid (55.48 individuals/leaf) and Alphacypermethrin (56.03 individuals/leaf) treatments.

The number of Phytosiieds predators were very low in all the treatments including the untreated control.

This study showed that some of codling moth insecticides decreased the number of spider mites like chlorpyrifos, whereas some of them caused significant increase in numbers, and consequently should be avoided in controlling apple pests