EI·Naggar, M., EI-Fakharany, I. (2002). EFFECT OF CONTROLLED RELEASE CHLORPYRIFOS FORMULA TIONS ON THE DEVELOPMENT OF CULEX Pip/ens qu;nquefasc/atus (SA Y) POPULATIONS IN THE LABORATORY. Journal of Plant Protection and Pathology, 27(9), 6453-6466. doi: 10.21608/jppp.2002.254000
M. F. EI·Naggar; I. I. EI-Fakharany. "EFFECT OF CONTROLLED RELEASE CHLORPYRIFOS FORMULA TIONS ON THE DEVELOPMENT OF CULEX Pip/ens qu;nquefasc/atus (SA Y) POPULATIONS IN THE LABORATORY". Journal of Plant Protection and Pathology, 27, 9, 2002, 6453-6466. doi: 10.21608/jppp.2002.254000
EI·Naggar, M., EI-Fakharany, I. (2002). 'EFFECT OF CONTROLLED RELEASE CHLORPYRIFOS FORMULA TIONS ON THE DEVELOPMENT OF CULEX Pip/ens qu;nquefasc/atus (SA Y) POPULATIONS IN THE LABORATORY', Journal of Plant Protection and Pathology, 27(9), pp. 6453-6466. doi: 10.21608/jppp.2002.254000
EI·Naggar, M., EI-Fakharany, I. EFFECT OF CONTROLLED RELEASE CHLORPYRIFOS FORMULA TIONS ON THE DEVELOPMENT OF CULEX Pip/ens qu;nquefasc/atus (SA Y) POPULATIONS IN THE LABORATORY. Journal of Plant Protection and Pathology, 2002; 27(9): 6453-6466. doi: 10.21608/jppp.2002.254000
EFFECT OF CONTROLLED RELEASE CHLORPYRIFOS FORMULA TIONS ON THE DEVELOPMENT OF CULEX Pip/ens qu;nquefasc/atus (SA Y) POPULATIONS IN THE LABORATORY
Faculty of Agriculture, Kafr EI·Sheikh, Dept. of Pesticides, Tanta Uiversity, Egypt
Abstract
Laboratory evaluatlons were conducted for 8 weeks to compare the residue levels maln!ained in water treated with eight chlorinated ~.olyethylene pellet formulations of chlorpyrifos.The eight formulations were of four Particle sizes, each at two chlorpyrifos concentrations. All Pellets were cylindrical in shape, had a specifIC gravily :> 1.0 and each was evaluated at dosages of 1.0 ppm and 2.0 ppm in laboratory test jars.
In the laboratory tests. average weekly residues for all formulations increased significantly through week 4. leveled off through week 7, and showed a second significant increase at week 8: and Ihe 2.0 ppm dosllge resulted in significantly higher residues than the 1.0 ppm dosage. except at week 1 after treatment. For each rormulation there was no signlficanl differences due to percent chlorpyrifos therein.
The effects of low-level concenlration of chlorpyrifos on the development of CUlex p < /em>lp < /em>iens qu;nquefasciatus (Say) populations from the time of hatching until adult emergence. The low-level concentrations were determined below the LCso (0.9 ppb) by treating laboratory test jars with various numbers of polyvinyl chloride (PVC) petrelS containing 0.1 percent chlorpyrifos. Control average of the laboratory populations were 47.3 % in jars containi"g average residues of < 0.10 ppb; 72.2 % in jars containing average residues of 0.14 ppb; and 9~1.7 % in jars containing average residues of 0.32 ppb.
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