The Effect Of Insecticides And Tomato Cultivars On The Percentage Of Parasitization Of Trichogramma Brassicae On Tomato Leaf Miner Eggs (Tuta Absoluta)
Keywords:
Matrine, Flubendiamide, Chlorantraniliprole, Spinetoram, Cyantraniliprole, Tuta absoluta, Trichogramma brassicae.Abstract
Tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is an invasive and dangerous pest that threatens tomato production in worldwide. The aim of this study was to study the effect of different cultivars along with the insecticides tested on the ability of Trichogramma to parasitize. The parasitism of tomato leaf miner eggs by Trichogramma wasps on three tomato cultivars (Rio Grande, Superstrain B and Cal j N3) was investigated. To investigate the parasitism of surviving wasps from the experiment on the effect of 25% concentration of 5 pesticides) matrine, flubendiamide, chlorantraniliprole, spinetoram and cyantraniliprole), an experiment was conducted in three replicates with five female wasps and 100 tomato leaf miner eggs on each tomato cultivar in a completely randomized manner for 48 hours in cylindrical plastic containers. Analysis of variance of percentage reduction in parasitism showed that the effect of cultivar was not significant (F = 0.06; P = 0.9411). The insecticide effect was highly significant (F = 10.19; P < 0.0001), confirmed the large difference in insecticide compatibility. The insecticide chlorantraniliprole showed the highest reduction with average of 35.65% reduction in parasitism. This rate was significantly higher than matrine and flubendiamide and was placed in category 2 according to the IOBC guidelines. Cyantraniliprole (32.04%) and Spinetoram (30.26%) were also in category 2 and did not differ significantly from chlorantraniliprole. Matrine (18.10%) and flubendiamide (13.35%) were placed in the first category and had the least negative effect.
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Copyright (c) 2026 Zahra Khanbabaei, Mir Jalil Hejazi, Gholamhossein Gharekhani
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