Document Type : Original Article
Authors
1
Pesticides Analysis Researches Department, Central Agricultural Pesticides Laboratory, Agricultural Research Center, Dokki, Giza, Egypt.
2
Applied Center of Entomonematodes, Faculty of Agriculture, Cairo University, Giza, Egypt.
Abstract
The stability of three acaricides (Pyridaben 20% WP, Spirozed 24%EC, and Actara 25%WG) was investigated. The tested acaricides were stored at 54 ± 2 °C for 14 days. During the different storage periods, samples were taken after 1, 3,7, and 14 days to determine the active ingredient content, physical properties, fingerprint (GC/MS), and toxicological properties against Tetranychus Urticae. Data showed that the half-life of in three acaricides used were 28.42, 61.46, and 662.09 respectively in Pyridaben, Spirozed, and Actara. From this data, we conclude that Actara25% WG is more stable than Spirozed 24% WP than Pyridaben 20% EC. According to FAO specifications, samples conform to the specifications in the physical properties. The effect of pyridaben for 14 days storage in 54° of against T. urticae by (1,10,25 and 50 ppm) were (27, 29,5, 2.7,5, and 26,5) effect of Actara for 14 days storage in 54 C of against T. urticae by (1,10,25 and 50 ppm) were (80, 87, 83, and 80)% produced respectively % mortality. The estimated lethal concentration value for LT was (79 μl L-1 air) in 50 ppm Actara effect of Spirozedfor 14 days storage in 54 ± 2 °C of against T. urticae by (1,10,25 and 50 ppm) were (70, 70, 61, and 60) produced respectively % mortality, the effect of Actara for 14 days storage in 54 ± 2 °C of against T. urticae by (1,10,25 and 50 ppm) were (80, 87, 83, and 80)% produced respectively % mortality. The estimated lethal concentration value for LT was (79 μl L-1 air) in 50 ppm. This research aims to investigate the degradation of three acaricides (Pyridaben 20% WP, Spirozed 24%EC, and Actara25% WG) after storage 14 days at 54± 2°Cwe found thatActara 25%WG is more stable than Spirozed 24% WP Pyridaben 20% EC. Also toxicity studies showed that Actara 25%WG was the most lethal effect against mites after 14 days of storage this cleared that some active ingredients are more resistant against high-temperature storage. Also clear that some pesticides such as Actara are more resistant against high-temperature storage.
Keywords
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