Safety and proper use of pesticides on orange fruits

Abstract

The aim of this work is studying the correlationbetween applicable control of Parlatoriaziziphi (Lucas)and obtained healthy and high quality orange fruits. So, the objective of this research was organized through three parts, The first part was conducted in orange orchard atQalubyia Governorate to evaluate the pesticidal efficiency of four compounds representing three insecticidal groups (Neonicotinoid, Avermectin and Organophosphrus) to struggle P. ziziphi on orange trees and protect the crop from theinsect damage. The results published that Agriflex has the highest toxicity ofthe tested compound on P. ziziphi population and recorded 74.3% reduction,followed by Best (73% reduction), then Sunfidor (70.18% reduction) while Reldan came in the last order with69.7% reduction. Also the statistical analysis elucidate the time uphold theefficiency of the four tested compound and the highest percentages reduction ofP. ziziphi population after thirty days of application whencompared by the other intervals. The second part: to determine the residues ofthe tested pesticides in orange fruits through initial time (zero time) andfinal time (at harvest). The results showed that the values of initial depositsof all tested insecticides were surpassed the maximum residue limits (MRL)while no residues of pesticides detected at harvest time (after 20 days ofapplication).The third part: to examine the effect of the tested insecticideson quality orange fruit. Results obtained showed that all tested insecticidesdecreased the total soluble solids (TSS), total titratable acidity (Ta),Ascorbic acid and total sugar without significant differences except Best whichincrease the total sugar than untreated fruits while all tested insecticidesexhibited non-significant increase on relative sweetness of orange fruits thanuntreated except Agriflex. The ratable data showed that all tested pesticides exhibited satisfied effect against P. ziziphiranged from 69.73 to 74.31% reduction. They are safe at harvest interval 20days after treatment. Also, they showed insignificant effect on orange fruitsquality. It could be recommended Best 25% WP as it caused increase in totalsugar in orange fruits, than un-treated; also fruits had the highest value oftotal soluble solids and acidity than other pesticides.