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In the years 1992-1994, studies were carried out on the occurrence, harmfulness and chemical control of the broad bean weevil on broad bean crops at different dates. A maximum of the beetle occurrence on the plantation under study was noted in III decade of June and in I decade of July. Seed damages caused by this pest ranged from 31.3 to 45.7%. The best time for the broad bean weevil control on broad bean was in the stage of pod formation. The application of the insecticide Karate 025 EC at the rate of 0.3 dm³/ha caused limitation of seed damages, on the average, by 19. 7%, which gave a mean yield gain of 0.3 4 t/ha.
In the years 1992-94 studies were carried out on the occurrence of the broad bean weevil at the broad bean plantations and evaluation of the effect of insecticidal seed dressings upon this pest. The first beetles of the broad bean weevil begin their flight over the plantation before plant flowering (the 3rd decade of May, the 1st decade of June). A maximum of the laid out eggs was noted in the 2nd and 3rd decades of July. The best effects of the pest control were obtained by applying the insecticidal seed dressing Gaucho 350 FS-and by spraying plants at the pod setting phase with insecticide Karate 025 EC. The performed treatments reduced the seed damage of field bean by, on average, 16.6% and increased the yield by, on average, 0,62 t per ha.
In the years 1992-1994, studies were carried out on the occurrence, harmfulness and chemical control of the broad bean weevil on broad bean crops at different dates. A maximum of the beetle occurrence on the plantation under study was noted in III decade of June and in I decade of July. Seed damages caused by this pest ranged from 31.3 to 45.7%. The best time for the broad bean weevil control on broad bean was in the stage of pod formation. The application of the insecticide Karate 025 EC at the rate of 0.3 dm³/ha caused limitation of seed damages, on the average, by 19. 7%, which gave a mean yield gain of 0.3 4 t/ha.
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