The Role of Nu-Film-17 Spreader in Improvement Droplets Distribution and Increasing Insecticidal Activity of Certain Insecticides on The Spiny Bollworm, Earias insulana ON Cotton Plants in Egypt.

Field experiments were carried out of about 14 karats planted with (Giza 86) cotton variety during seasons 2018 and 2019 on 15^th  July and 1^st, 15^th August in a field located at Qaha Research Station, Plant Protection  Research Institute, Qalyoubia governorate. The selected area was split into 6 plots and the control plot. Two alternative products include Chlorpyriphos (OP's), and Chlorflurzoran (IGR's) were sprayed by using Rotary Matabi sprayer (18 L./fed.) on cotton field highly infested with cotton Spiny bollworm, Earias insulana larvae. All tested Insecticides revealed a significant negative influence on Earias insulana larvae. The most effective on reduction percentages of bolls infestation was Chlorpyriphos withNU-FILM -17 SPREADER^®1% ,5% followed by Chlorflurzoran withNU-FILM -17 SPREADER^® 1% ,5%    with Rotary Matabi sprayer (18 L./fed.). It could be recommended to use these Insecticides with Low Volume spraying equipment with not less than (18L/Fed.). A satisfactory coverage was obtained on cotton plants. The spectrum of droplets ranging between 120-170 mm (VMD). With sufficient number ranging from 13-265 N/cm². The rate of performance of Rotary Matabi sprayer (18 L./fed.). was 2.4 Fed./day. The results indicated that there was no significant difference between using NU-FILM -17 SPREADER^®   1% or 5% in reduction percentages of bolls infestation. Using both Chlorpyriphos and Chlorflurzoran with NU-FILM -17 SPREADER^® 1%   could be recommended in controlling Spiny bollworm, Earias insulana larvae because it increased droplets numbers 54%, decreased droplet sizes 17 % and minimized lost spray on ground 44% which made good spray quality, homogeneity and spray coverage.  Also, Low Volume spraying reducing the time lost in the process filling the machines with the spray solution and saving the lost spray on the ground certainly in small plantation around villages.