Study of the lethal residual effect of some pesticides on predatory Macrolophus caliginisous under laboratory conditions

Abstract

The residual lethal effect   for some biotic pesticides Azadirachtin (Neembicidin1%), Emamectin benzoate (Contact 50g/kg), and entomopathogenic fungus Beuveria bassiana (10⁷spore/ml) against the residues chemical pesticide Chlorofenapyr (Pirate 24%) on adults and nymphs of Macrolophus caliginosus was studied in Laboratory of Scientific Center Agricultural Research in Tartous, year 2024.

The results showed that the mortality rate of adults was as follows (0%,100%,60%,0%) after 72 hours for pesticides Emamectin benzoate, Chlorofenapyr, Azadirachtin, Beuveria bassiana respectively.

According to the standards of the International Organization for Biological Control (IOBC), Emamectin benzoate and Beuveria bassiana came in the first class (1-harmless), Chlorofenapyr came in the second class (2-slightly harmful) and Azadirachtin came in fourth class(4-harmful). the results showed that the mortality rate of nymphs was as follows (0%,66,6%,100%,20%) after 72 hours as it was before respectively.

Also according to IOBC: Emamectin benzoate and Beuveria bassiana came in the first class (1-harmless), Azadirachtin came in second class (2-slightly harmful) and Chlorofenapyr came in the fourth class (4-harmful).