العلاقة ما بين المواعيد الزراعية للسمسم و الإصابة بحشرات القرون

Abstract EN

During two successive growing season (1982 / 83 and 1983 / 84), field experiments were conducted at the Kod Research Station, to study the effect of planting dates on sesame infestation with pod worm and gall midge.

Results obtained clearly showed a significant effect of planting date on pods infestation with both insects.

Early planting dates resulted in significantly higher yields and lower insect infestation levels.

There was a reduction in yield of 18.7 kg/ha for every 1% increase in insect infestation level.

Infestation with pod worm was very low in both seasons, whereas infestation with the gall.

midge was high (around 97% of total infestation).

Results also showed that estimating infestation level only once at 50 days after planting was enough to reliably predict yield loss at the end of the growing