www.eajbs.eg.net Field comparison between droplet distribution and the bioresidual activity of different insecticides against Spodoptera littoralis (boisd) by using certain ground spraying equipment on cotton platns

Entomology Journal publishes original research papers and reviews from any entomological discipline or from directly allied fields in ecology, behavioral biology,

Three insecticides; Selecron, Trebon and Patron were sprayed using Knapsack motor sprayer Cifarilli (20 L./Fed.) and Economy Micron ULVA (15 L./Fed.) in cotton field infested with the cotton spiny bollworm Earias insulana (Boisd.) larvae during 2014 cotton season at Qaha district, Qalyoubia Governorate. The spectrum of droplets size ranging between 140-169 microns (VMD) with sufficient number ranging from 14-276 droplets/cm². The productivity of motor sprayer Cifarilli was 12 Fed./day. It was the best equipment, but the lowest productivity was 3.04 Fed./day by using Economy Micron ULVA. Results indicated that Trebon and Selecron insecticides were almost behave to be equitoxic effective in controlling larvae of cotton bollworm on cotton plants than the Patron insecticide with Economy Micron ULVA (15 L./Fed.) followed by Knapsack motor Cifarilli sprayer (20L./Fed.). The efficiency of the tested insecticides could be descendingly arranged as follows: Trebon, Selecron and Patron. The corresponding general reduction rates were 91.١٥, 55.99 and 92.51% in case of using Micron ULVA equipment and 91.13, 55.19 and 92.20% in case of using Knapsack motor Cifarilli sprayer, respectively. Data showed that, low volume spraying may be recommended because of reducing the time lost in the process filling the machines of reducing the time lost of the spray solution on the plant leaves and saving the lost spray via run off on the ground.

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 m (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%.

Field experiments were carried out in an area of about 2 feddan planted with bean plants variety (Sakha 2) Vicia faba (L).during season 2014 in 12 th December at Sakha ,Kafr Elsheikh Governorate. The selected area was split into 7 plots including control plot. Primicarb was sprayed with the rate of recommended and 3/4 recomended dose rate and one treatment left without spraying as control by using Hydraulic Knapsack sprayer (Solo) (22 L./Fed.), Economy Micron ULVA sprayer (15 L/Fed.) and Conventional motor sprayer (Wisconson) (400 L/Fed.) Data indicated that, all tested doses revealed significant negative influenced on Aphis fabae survival. The most effective is total recommended dose followed by 3/4 recommended dose. It could be recommended to use these compound with LV spraying equipment with not less than (15L/Fed.).The data showed that Hydraulic Knapsack sprayer (Solo) was the pest equipment to control Aphis fabae on bean plants. The rate of performance of Solo sprayer was 10 Fed./day. It was the best equipment, but the lowest rate of performance was Wisconson motor sprayer since it could spray only 2.5 Fed./day.