EFFECT OF SPRAYING WITH SOME AGRICULTURAL CHEMICALS ON INDUCING TOMATO PLANT RESISTANCE AGAINST TETRANYCHUS URTICAE (KOCH)

Abstract

The results of the study of the effect of spraying with some agricultural chemicals on the seasonal activity of T. urticae during the season 2019-2020 showed that the lowest general average of these numbers was when treated with the growth regulator Horm on 93.33 individuals/10 leaves, which differed significantly from all other spraying treatments as well as the comparison treatment (115.12 individuals/ 10 leaves) and that the lowest general average of these numbers was on 26/10 reaching 19.80 individuals/10 leaves, and the local variety was significantly distinguished in achieving the lowest average of these numbers 104.09 individuals/10 leaves compared to the GS variety (132.47 individuals/10 leaves). The spraying treatments varied between them with regard to reducing or increasing the numbers of mites on leaves tomato is the GS variety and treatment with Horm, Fylloton and Grofalex led to a decrease in the averages of these numbers compared to the treatment of the control experiment, while the role of the rest of the treatments (Appetyzer, Acadian, Grofalex + Horm) was negative in this area, as it led to an increase in the sensitivity of these plants to infection. The GS variety was significantly superior in giving the highest content of carbohydrates, phenols and flavonoids, which amounted to 0.67 g, 12.91 mg, 4.35 mg, respectively, compared with the local variety, while the local variety was significantly superior in the leaves content of proteins only (5.12 g) compared with the GS variety.

Keywords

• induced resistance
• tomato variety
• tetranychus urticae
• agricultural chemicals