An a ttempet to estimate honeydew production of different stages of ommatissus iybicus de 'berg. (homoptera : tropoduchidae) in vitro [electronic resource].

Includes reference.

Honeydew produced by the mobile stages of Ommatissus Iybicus De Berg, indirectly affects the physiology of date palm leaves leading to reduction in the fruit yield and quality. The capacity 0 f each s!age 0 f the insect producing honeydew is assessed as the number of droplets produced per hour. The nymph instarsproduced higher number of droplets per hour (from 6.4 to 7.6), while the adult produced the less number of droplets (2.3 for female and 2.9 for male). However, the female adult produced the largest droplet size (734 microns in diameter) while the first nymphal stage produced the smallest (diameter 157 microns). The calculated volume of produced honeydew obviously showed that the fifth nymphal instar is producing 73 ' times of honeydew more than that produced by the first nymphal instar within one hour. The obtained results suggested another possibility to determine the critical level of O. Iybicus infestation on which the control methods should be considered.

Summary in Arabic.

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