Weather Factors and Plant Age Influencing the Bionomics of The Tomato Leaf Miner, Tuta absoluta (Meyrick) and Its Control in Dakhlia Governorate, Egypt

Document Type : Original Article

Authors

Department of Vegetable, Medicinal, Aromatic and Ornamental Plant Pests, Plant Protection Research Institute, Agricultural Research Center, 12619 Giza, Egypt

Abstract

The present study examined the population estimates of tomato leaf miner T. absoluta larvae on tomato plants (Hybrid T4 84 cultivar) in relation to climate, plant age, and its control during two consecutive seasons (2022/2023 and 2023/2024) in the Dakhlia governorate, Egypt. According to the data, T. absoluta larvae were found on tomato plants thirty days after they were planted, or between October 2nd and January 23rd in both seasons. Over the course of the two seasons, the total number of T. absoluta larvae was 1365.00 and 371.00, respectively. Throughout the two seasons, the average number of T. absoluta larvae per 10 plants was 23.19 ± 1.56 and 22.81 ± 1.63, respectively. 
According to statistical analysis using the multiple linear regression approach, the total impact of plant age and climate on the variation in T. absoluta larval population was 91.74 and 86.78% in both seasons, respectively. Following a three-day assessment of the four insecticides' effectiveness, the activities of the tested pesticides showed that chlorfenab was the least harmful and emamectin benzoate was the most susceptible of the evaluated insecticides on larvae in their second and fourth instars.
In order to reduce losses, growers might use the previous information to create a good management program for T. absoluta invasion in tomato fields.

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