Effect of egg parasitoid density on the population suppression of Sunn Pest, Eurygaster integriceps (Hemiptera: Scutelleridae), and its resulting impact on bread wheat grain quality |
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| Authors: | Abdul Nasser Trissi Mustapha El Bouhssini Joumaa Ibrahem Mohammed Abdulhai Bruce L Parker William Reid Fouad Jaby El-Haramein |
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| Institution: | (1) Department of Plant Protection, Faculty of Agriculture, Aleppo University, Aleppo, Syria;(2) International Center for Agricultural Research in the Dry Areas, ICARDA, p.o. Box 5466, Aleppo, Syria;(3) General Commission for Scientific Agricultural Research, Aleppo, Syria;(4) The University of Vermont, Entomology Research Laboratory, Burlington, VT, USA |
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| Abstract: | The impact of the density of Sunn Pest egg parasitoids, Trissolcus
grandis Thomson (Hymenoptera: Scelionidae), at three levels of Sunn Pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), infestation was assessed on bread wheat variety Cham 6 in screened cages in the field for
percentage of egg parasitism and grain quality. Percent parasitism ranged from 60.1 to 83.9%. No statistically significant
differences were detected at parasitoid densities of 1, 2, or 3 insects per square meter at Sunn Pest densities of 2 or 4 insects
per square meter. The quality of grain collected from all Sunn Pest infested cages without egg parasitoids was unacceptable
for baking purposes and was significantly lower than grain from both non-infested plots and plots where either two or three
egg parasitoids were present. The abundance of egg parasitoids in Al Hassakeh province in Syria was also determined. Egg parasitism
was observed 1 week after the initiation of Sunn Pest oviposition and ranged between 22 and 59% in non-insecticide treated
fields, while no parasitoids were recovered from insecticide treated areas within the same region. The impact of feeding by
Sunn Pest on different wheat stages indicated that only feeding prior to the spike stage does not affect the bread-making
quality of the grain. |
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| Keywords: | Biological control Egg parasitoids Eurygaster integriceps Grain quality |
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