Deltamethrin residues applied in different formulations in staked cucumber and the actions of insecticides on the pickleworm control

Abstract

Pesticide residues, especially in vegetables and fruits, are a reason for concern with respect to the health of consumers and workers that need to return to areas that have been treated with these agrochemicals. The objectives of this experiment were to (a) study the behavior of deltamethrin residues from different formulations on cucumber fruits; and (b) correlate insecticide contents in the fruits with pickleworm control. Treatments were as follows: (a) control; (b) three 30 mL applications of deltamethrin 25 EC 100 L-1 water (emulsifiable concentrate formulation); (c) three 7.5 mL applications of deltamethrin 100 EC 100 L-1 water (emulsifiable concentrate); and (d) three 3.75 mL applications of deltamethrin 200 CS 100 L-1 water (concentrate suspension). Samples were taken at (-1), zero, 1; 3; 5; 7, and 14 days after the last application. Residues were determined by the gas chromatography technique, using an electron capture detector. In order to evaluate insecticide effectiveness, six infestation surveys were conducted during the same sampling times. Although at low levels, the deltamethrin residues in the fruits were above the maximum residue level (MRL = 0.03 mg kg-1), even one day after the end of the safety interval (2 days), and were higher for the CS formulation. The insecticide was effective to control the pest during the entire evaluation period.

Dissipation Kinetics of Deltamethrin 10 EC in Capsicum (Capsicum Annum var. Frutescens) and Cropped Soil Under Field and Polyhouse Conditions

“…Since, it was found that deltamethrin was commonly used (Dhore, 2016;Sali, 2016) on capsicum in the region; the present study was conducted to analyse degradation variations of deltamethrin in polyhouse and eld grown capsicum. Deltamethrin is a pyrethroid ester insecticide, found effective against sucking insect pests on glasshouse cucumbers, tomatoes, peppers and ornamentals (Baptista et al, 2008) besides managing numerous insect pests of eld crops with low application rates (Deo et al, 1991). Deltamethrin is not recommended or label claimed in capsicum under recommended insecticides list of Central Insecticide Board and Registration Committee (CIB and RC) of the Government of India.…”