El-Naggar,, M., El-Fishawy, A., Mahrous, M., Elawa, M. (2007). EFFECT OF PREY TYPE AND PESTICIDES ON SOME BIOLOGICAL ASPECTS OF THE PREDATORY MITE Agistemus exsen‘us GONZ. ( ACARI: STIGMAEIDAE). Journal of Plant Protection and Pathology, 32(1), 5499-5506. doi: 10.21608/jppp.2007.235245
M. E. El-Naggar,; A. A. El-Fishawy; M. A. Mahrous; M. M. Elawa. "EFFECT OF PREY TYPE AND PESTICIDES ON SOME BIOLOGICAL ASPECTS OF THE PREDATORY MITE Agistemus exsen‘us GONZ. ( ACARI: STIGMAEIDAE)". Journal of Plant Protection and Pathology, 32, 1, 2007, 5499-5506. doi: 10.21608/jppp.2007.235245
El-Naggar,, M., El-Fishawy, A., Mahrous, M., Elawa, M. (2007). 'EFFECT OF PREY TYPE AND PESTICIDES ON SOME BIOLOGICAL ASPECTS OF THE PREDATORY MITE Agistemus exsen‘us GONZ. ( ACARI: STIGMAEIDAE)', Journal of Plant Protection and Pathology, 32(1), pp. 5499-5506. doi: 10.21608/jppp.2007.235245
El-Naggar,, M., El-Fishawy, A., Mahrous, M., Elawa, M. EFFECT OF PREY TYPE AND PESTICIDES ON SOME BIOLOGICAL ASPECTS OF THE PREDATORY MITE Agistemus exsen‘us GONZ. ( ACARI: STIGMAEIDAE). Journal of Plant Protection and Pathology, 2007; 32(1): 5499-5506. doi: 10.21608/jppp.2007.235245
EFFECT OF PREY TYPE AND PESTICIDES ON SOME BIOLOGICAL ASPECTS OF THE PREDATORY MITE Agistemus exsen‘us GONZ. ( ACARI: STIGMAEIDAE)
1Plant Protection Research Institute. Dokki. Giza. Egypt
2Plant Protection Dept. Faculty of Agric.. Zagazig Univ... Zagazig, Egypt
Abstract
The present study aimed to throw light on certain biological aspects of the
predatory mite Agislemus exsen‘us Gonz. when fed on eggs, immatures and
pesticide-treated nymphs of Tefranychus urticae Koch. Results indicated that,
duration of immature stages of A. exsertus were insignificantly influenced by the
stage of the introduced prey. The female and male life cycle durated an average of
10.89 and 10.48 days when fed on eggs of T. urticae, while the parallel values were
11.15 and 10.76 days when fed on immatures of the same prey. Female lived longer
than male. Longevity of female and male were shorter on immature stages than on
eggs of the prey. Feeding on T. urticae eggs resulted greater number of eggs (62.57
eggs) than fed on immature stages (57.22 eggs). Life span for the predator female
and male lasted 29.48 and 27.31 days, respectively when mites fed on immatures of
T. urticae. This periods were extended to 32.26 and 28.31 days for female and male
respectively when reared on eggs of T. urticae. Food consumption of A. exsen‘us
female and male stages was significantly affected by the stage of the prey. Means of
total and daily devoured prey individuals were obviously increased with successive
developmental stages. Female consumed greater number of eggs or immature
stages of the prey than male. Longevity, fecundity and food consumption of A.
exsertus female were significantly diminished when fed on nymphs of T. urticae
treated with certain pesticide. Vertimec was the most deleterious one followed by
Challenger and Ortus. while M-pede was the least one in this respect. Generally.
conjoint usage of the tested pesticides and A. exsen‘us in IPM may require'applying
chemicals and biocontrol agent in sequence separated by time intervals that would
be sufficient to minimize toxicity effects on the predator.
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