تقويم أولي لإطلاق ذبابة الهالوك Kalt. Phytomyza orobanchia في مكافحة الهالوك للمتفرع Orobanche ramosa L. المغطى بأقفاص من للموسلين في حقول البندورة الطماطم

Abstract EN

The study aimed to conduct preliminary evaluation on the efficiency of releasing adults of Phytomyza orobanchia, under cages, at three releasing rates: 3, 6 and 12 adults/Orobanche plant, to control branched broomrape (Orobanche ramosa L.) on tomato crop, under semi-field conditions, during 2014/2015 growing season.

The results indicated an increase of infestation rate of O.

ramosa seeds capsules infested with P.

orabanchia larvae, with increase in release rate.

releasing rate of 3 adults/plant, was enough to increase the infestation rate of infested capsules up to 80 %, three weeks after release date, in comparison with 32.5% for the control treatment (without release).

The larvae of P.

orobanchia, fed inside seed capsules, caused reduction in the dry weight of Orobanche plants and weight of seeds, obtained from the release treatments, with significant differences between the control and two release rates of 6 and 12 adults/plant.

The reduction rate of seeds weight reached 27.9%, 55.9% and 60.1% for the release rates of 3, 6 and 12 adults/plants, respectively.

The results highlighted the importance of releasing P.

orobanchia adults in increasing the natural efficacy of this fly on O.

ramosa in tomato fields, and its potential role in reducing the seed bank in the soil.