دارسة المكونات السكرية لرحيق أزهار بعض النباتات الطبية المزروعة و مقارنتها بالعسل في تأثيرها في خصوبة و طول حياة متطفل بيض السونة Trissolcus grandis Thamson

Abstract EN

grandis Thomson.

Arab Journal of Plant Protection, 32(2): 103-108 Flower nectar is an important source of nutrition for natural enemies.

The objectives of this study were to determine the main sugar constituents of flowers nectar of the cultivated medicinal flowering plants (Coriandrum sativum, Pimpinella anisum, Foeniculum vulgare, Fagopyrum esculentum) and compare with honey in its effect on fertility and longevity of the sunn pest egg parasitoid T.

grandis.

The results showed that the nectar of most of these flowers contained three main sugars (sucrose, glucose and fructose) with varying concentrations.

Honey had significantly higher concentrations of these sugars, followed by C.

sativum.

F.

esculentum had the least concentrations of sucrose, fructose and no glucose.

There were higher numbers of parasitized eggs of T.

grandis when fed on flowers of C.

sativum compared to honey and F.

esculentum with 121.1, 118.2 and 114.7 parasitized eggs, respectively.

However, feeding T.

grandis on honey gave longer adult longevity than the flower’s nectar of the medicinal plants with 43.6, 23.5 and 23.2 days for honey, C.

sativum, and F.

esculentum, respectively.

The results obtained showed that the type of sugars and their concentration in flowers’ nectar of the medicinal plants studied influenced adult longevity and fertility of the sunn pest parasitoid T.

grandis.

Planting coriander alongside wheat fields could help conserve and enhance sunn pest parasitoids.