Infestation predisposition and relative susceptibility of certain edible fruit crops to the native and invading fruit flies (diptera : tephritidae)‎ in the new valley oases, Egypt

الملخص EN

Infestation predisposition and relative susceptibility of the most common edible fruits cultivated in the New Valley Oases against Ceratitis capitata (Wiedemann) and Bactrocera zonata (Saunders) have been determined.

Because high percentage of pupae was unable to produce adults, the percentage of the emerged adult flies was used to express the real ability of infestation.

At Kharga province Naring ranked the first in terms of the infestation predisposition by 57.04 % real infestation.

The rest host fruits exhibited variable infestation predisposition lasted by Apple (11.25 %).

Quitely difference in the infestation predisposition appeared in Dakhla Oases.

In Moot province, Guava ranked the first by 45.00%.

However, in Bodkholo province Apricot ranked the first by 62.22 %.

Variations among the rest of the tested host plants were determined and discussed.

In general, data showed that B.

zonata ranked the first in respect to the number and the percentage of the emerged adults than C.

capitata.

Classification of the tested host plants to their susceptibility degrees to fruit flies indicated that Naring ranked the first in terms of susceptibility to C.

capitata and B.

zonata complex and appeared as highly susceptible (HS) host plant.

It followed by Guava and Orange which appeared as susceptible (S) host plants.

Inversely, Mandarin and Apple showed some sort of resistance and appeared as relatively resistant (RR) host plants.

However, Mango appeared as moderately resistant (MR), because it harbored the lowest numbers of emerged adult flies.

On the other hand, Fig could be considered as a resistant (R) host plant, because no adult flies emerged from pupae collected from its fruits.

Host plants free from infestation were hoped but not found.