EVALUATION OF SOME EGYPTIAN COTTON VARIETIES TO INFESTATION OF PIERCING SUCKING INSECTS, COTTON LEAFWORM AND BOLLWORMS AT KAFR EL-SHEIKH REGION | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 4, Volume 29, Issue 1, January 2004, Page 433-441 PDF (115.71 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2004.239500 | ||||
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| Author | ||||
| G. A. EI-Mezayyen, | ||||
| Plant Prot. Res. lnst., Sakha Agric. Res. Sta., Agric. Res. Center | ||||
| Abstract | ||||
| Six cotton varieties were evaluated for susceptibility to infestation with certain piercing sucking insects, cotton leafworm and the pink and spiny bollworms at the Experimental Farm, Sakha Agricultural Research Station (North Delta) during 2002 and 2003 seasons. The highest n umbers a f aphids e xlsted on cotton variety Giza 85, white Giza 89 and Giza 70 harboured the least numbers. However, Giza 45 and Giza B9 were the least infested varieties with whiteflies and jassids which showed the highest affinity to varieties Giza 89 and Giza 86, respectively. On the other hand, Giza 88 attained the highest number of cotton leafworm larvae. while Giza 89 exhibited the lowest number of this insect. Also, Giza 45 (late bloomer variety) was the most susceptible to infestation with Pectinophora gossyp < /em>ie/la (Saund.) and Eanas insulana (Boisd.) and harboured the highest numbers of larvae 0 f t he two bollworms. However, Giza 89 (early bloomer variety) was the most resistant one to both bollworms. The combined effect of temperature, relative humidity and wind velocity was more pronounced on piercing sucking insect populations on Giza 45 and Giza 85 varieties in the second season, with values of 71.50 and 70%. respectively. | ||||
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