Abstract
Field experiments were carried on soybean variety (Giza 111) during two successive seasons 2019 and 2020. Two natural compounds were tested, Humic acid, Chitosan Nano-particles (C.N.Ps) and a common acaricide, Abamectin, of recommended dose rates and one treatment left without spraying as control by using Economy Micron ULVA sprayer (15L./fed.) and Hydraulic sprayer (Matabi) (56 L/Fed.). Data indicated that all tested compounds induced significant negative influenced on Tetranychus urticae adult females' survival. Abamectin and humic acid revealed successful results followed by the C.N.Ps. Results showed that C.N.Ps have lower toxicity on T. urticae but it safer on all movable stages of Amblyseius californicus, Orius insidiosus, and Scolothrips sexmaculatus, the natural enemies associated. It could be recommended that using those compounds with LV spraying equipment with not less than (15 L. /Fed.). A satisfactory spray coverage was obtained on soybean plants. The droplets spectrum ranging from 150-170 mm (VMD). A sufficient number ranging from 18-199 N/cm². The data showed that the Economy Micron ULVA sprayer was the best equipment to control. Tetranychus urticae on soybean according to the homogeneity of the droplet spectrum. The rate of performance of Hand-held Hydraulic sprayer (Matabi) (56 L. /Fed.), Economy Micron ULVA (15 L. /Fed.) were 3.55 Fed. /day, 3.30 Fed. /day, respectively. Data also revealed that lost spray-on ground for Ulva sprayer was lower than Matabi sprayer with 35%.
Highlights
Soybean (Glycine max L.) is a common leguminous crop used in a wide world of food-derived
Efficacy of Abamectin Against Spider Mite T. urticae and Its Associated Predators A.californicus, O. insidiosus and S. sexmaculatus, on Soybean: The highest reduction in the population of T. urticae adult females occurred by Economy Micron ULVA sprayer (15 L/fed.)
A satisfactory coverage was obtained on soybean, the droplets spectrum was obtained in field experiment was agreed with the optimum droplet sizes which mentioned by Himel (1969), (Himel et al, 1969) in the optimum droplet size to control cotton leafworm in cotton fields by ground equipment
Summary
Soybean (Glycine max L.) is a common leguminous crop used in a wide world of food-derived. There are many different insects infesting soybean it in Egypt, some of them are detrimental, while others are beneficial. Serious yield production and quality reductions will result when pests' outbreaks occur and don't be managed. The two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae) is an extremely polyphagous species and a serious pest of a wide range of economically important crops, including soybean. High reproductive ability and short life cycle of T. urticae promotes the rapid development of resistance against some acaricides after a few applications. Resistance has been recorded for compounds in several countries, extraction of new chemicals and the Citation: Egypt.
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