Investigation of the effect of reduced doses of four insecticides (Dartone, Larvin, Avant, Consult) on the larvae of Diamondback moth (Plutella xylostella L.) under field conditions

Subject Areas : Plant Pests

Seyyd Heydar Mousavi Anzabi ¹ , Neda Kheradpir ²

1 - Assistant Professor, Department of Plant Protection, Khoy.C., Islamic Azad University, Khoy, Iran
2 - Assistant Professor, Department of Plant Protection, VaP.C., Islamic Azad University, Varamin, Iran

Received: 2024-11-21 Accepted : 2025-02-24 Published : 2025-03-18

Keywords: Brassicaceae, Chemical control, Dimondback moth, Field pest,

Abstract :

Cultivation of cabbage crops is one of the most important sources of income for farmers. The diamondback moth Plutella xylostella L. (Lep.: Plutellidae) is one of the most destructive pests of cabbage, causing significant damage every year. Chemical control of this pest is inevitable and the most basic strategy for suppressing the diamondback moth. In order to evaluate the effect of reduced doses of four insecticides, an experiment was conducted using a randomized complete block design at two different times in field conditions. Before spraying, sampling of pest larva density was done and pest infestation levels were observed in all experimental plots. Sampling the population of pest larvae was performed on cabbage plants on the third, fifth, seventh and ninth days after spraying. Simple and compound analysis of variance based on split plot in randomized complete block design revealed that insecticides (factor A), sampling time (factor B) and all their interactions showed significant difference at the 1% probability level (α=1%). The results of the compound variance analysis of the data on the effectiveness percentage of insecticides demonstrated that the treatments (Factor A) and sampling time had significant difference at the probability level of one percent (α=1%). Avant with the lowest number of larvae 0.86 and the highest percentage of effectiveness (71%). The first sampling time (third day after spraying) had the lowest infestation number of pest larva (1.47) and the highest effectiveness percentage of insecticide (55.3%). Larvin, on the other hand, was the least effective in pest control in this study.

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