opulation fluctuations of the cotton seed bug Oxycarenus hyalinipennis (Costa) was monitored on okra (Abelmoschus spp.) in Assiut governorate, northern Upper Egypt during 2009 and 2010. In both seasons the pest showed two peaks. The first peak was recorded in the third week of July, while the second one was recorded in mid August. Gradually increase of the pest numbers was detected before each peak and coincided with the increase of the nymphal stage populations. This could be proved that O. hyalinipennis may be having two generations on okra planted in northern Upper Egypt. The ability of certain chemical and safe alternative compounds in reducing O. hyalinipennis populations in okra dry fruits was determined. The chemical compound Sumithion 50% EC reduced the pest numbers by 92.21%. However, the tested safe alternative compounds had quietly less effect (ranged from 37.58% to 80.74%). Although the latter compounds ranked the second, they could be used as a promising tool in suppressing O. hyalinipennis infestation on okra dry fruits for their acceptable reduction percentage in the pest populations. Furthermore, they can be applied more than one time in one okra growing season.
Fourteen okra varieties were tested in Assiut governorate to estimate their fruit infestation degrees caused by the spiny bollworm Earias insulana (Boisd.) and to determine their susceptibility degrees against this insect pest. Irany, Red base and Balady 4 okra varieties recorded the highest infestation values with an average of 11.92% > 10.40% > 9.13%, respectively. However, Oraby, Balady 5 and Balady 6 okra varieties recorded the lowest values with an average of 6.93% > 6.79% > 6.75%, respectively, as an average of the two successive seasons of 2009 and 2010. The highest infestation was recorded during the last three weeks of August. Dependent on the mean numbers of (Bores + larvae), the tested varieties revealed different susceptibility degrees to the pest. Balady 5 and Balady 6 varieties harboured the lowest numbers and appeared as highly resistant (HR) varieties. The remaining varieties revealed different susceptibility degrees to the pest. Negative correlation was recorded between the numbers of hairs presented on fruit surface of both Balady 5 and Balady 6 varieties and the pest infestation. Therefore, okra varieties that showed some sort of resistance can be included among advanced breeding programs to select new varieties resistance to E. insulana.
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