Field evaluation of insect pests infesting Phaseolus vulgaris and their natural enemies in Beheira governorate

الملخص EN

Common bean Phaseolus vulgaris (L.) is considered one of the most important leguminous vegetable crops in Egypt.

Field studies were conducted at El-Rahmaneia region, Beheira Governorate during 2017 and 2018 seasons on common bean (P.

vulgaris).

This study aimed to evaluate certain pests infesting P.

vulgaris and their natural enemies.

The crop is sown in mid of February and harvested in June and second planting dates of the experiment were carried out from September to November.

The results showed that ten insect species belonging to eight families and five orders according to feeding behavior were noticed.

The results recorded the major pests during two successive summer plantation 2017 and 2018.

The highest total number recorded by Aphis craccivora Koch (Hemiptera: Aphididae).

exhibited 1100.33 individuals/25 leaves and the lowest total number recorded by Ophiomyia phaseoli (Tryon) (Diptera: Agromyzidae) as 64.33 individuals/ 25 leaves during summer season 2017 and 2018, respectively.The highest total number recorded during spring seasons during both 2017 and 2018, representedby A.

craccivora being 1125.63 individuals/ 25 leaves and the lowest number of O.

phaseoli being 74.00 individuals/ 25 leaves and the results noticed no significant difference between the two seasons.

The results indicated that 12 species of predators belonging to eleven families were recorded.

While the recorded parasitoids were 12 species in five families.

The present work here recorded the highest mean number of total mines (occupied and empty) caused by Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) larvae were significantly represented higher in summer plantation (March) during 2017 and 2018 represented by 21.95 and 18.31 individuals/ 25 leaves, respectively.

The parasitoids were recorded parasitized the leafminers were Opius dissitus (Muesebeck) (Hymenoptera: Braconidae), Diglyphus isaea (Walker) (Hymenoptera: Eulophidae) and Halticoptera sp.

(Hymenoptera: Pteromalidae).

Also the persentage of parasitism of a forementioned parasitiods was studied.