A study on the leaching of chlorpyrifos in an oil palm agro ecosystem was conducted in an oil palm plantation in Sepang, Selangor. The insecticide chlorpyrifos was sprayed using a knapsack sprayer at the recommended and double the recommended dosage. Soil samples were collected at different depths, viz. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm at the following intervals: -1 day (befor...

Chlorpyrifos, an organophosphorus insecticide, has been used to control termites since regulatory measures against the use of chlordanes were taken in September, 1986. We developed an improved gas chromatographic (GC) method for the assay of 3,5,6-trichloro-2-pyridinol (TCP) in the urine to use in the biological monitoring of exposure to chlorpyrifos. Urinary TCP was separated and determined ac...

Organophosphate pesticides, especially chlorpyrifos, are one of the most widely used insecticides in agriculture, but their toxicity and potential sensitivity effects on Anura, Fejervarya limnocharis still unknown. The purpose this investigation is to study F. (Anura: Dicroglossidae) tadpole lethal (survivability) sublethal (morphological alterations swimming activity) chlorpyrifos Dursban 200E...

Abstract Spodoptera frugiperda (J. E. Smith, 1797) is a polyphagous pest of global relevance due to the damage it inflicts on agricultural crops. In South American countries, this species one principal pests maize and cotton. Currently, S. also emerging as an important soybeans winter cereals in Brazil. Chemical control main tactics against frugiperda, even though resistance numerous modes acti...

Changes in Cholinesterase Activity, Nerve Conduction Velocity, and Clinical Signs and Symptoms in Termite Control Operators Exposed to Chlorpyrifos: Masahiro GOTOH, et al. Asahi Rosai Hospital—We have surveyed periodical medical examinations for pest and termite control operators (n=64) exposed to ch lo rpy r i fos and o ther organophosphate pesticides. Distribution of serum butyrylcholinestera...

the toxicity of chlorpyrifos to three iranian populations of two-spotted spider mite, collected from isfahan (isr), yazd (yz) and guilan (gus2) provinces were surveyed using the residual contact vial bioassay. the bioassay results showed that resistance ratios of isr and yz populations were 176.90 and 9.78 fold compared to the gus2 population, respectively. determination of esterase and glutath...

A field experiment was conducted to find out and compare the efficacy of Pyriproxyfen, Nitenpyram, Carbosulfan and Chlorpyrifos against aphid on Brassica juncea variety (Bahawalpur Raya) during Rabi 2016-17 at Regional Agricultural Research Institute, Bahawalpur, Pakistan. After 72 hours of treatment carbosulfan, nitenpyram and pyriproxyfen showed statistically similar results. Aphid population...

The joint toxicity of esfenvalerate and chlorpyrifos to the fathead minnow (Pimephales promelas) and the aquatic midge larvae (Chironomus tentans) was determined using comparisons to independent action (IA) and concentration addition (CA) models. Equipotent mixtures of the two insecticides were used for initial testing of both species. A secondary study evaluating the effects of low-level chlor...

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30