Occurrence of oospores of Phytophthora infestans in the field and under controlled conditions [electronic resource].

Includes reference.

Both A1 and A2 mating types of Phytophthora infestans were detected in EI-Behera governorate and the surrounding area where potato and tomato were intensively cultivated during the 2005-2006 growing season. The A2 mating type constituted 14.8% of the total isolates recovered (162) while A1 mating type constituted 83.9%. A 7.4% of the total potato and tomato fields (94) surveyed yielded A1 mating type and three fields only yielded both A1 and A2 mating types. Investigations were focused on fields where both mating types were occurred as opportunity for oospore formation presumably high. No oospores were detected in any of the blighted potato tubers and tomato fruits as well as the blighted potato and tomato leaves collected at harvest from fields showed both mating types. This was despite that two of 63 tubers sampled yielded both the A1 and A2 mating types and abundance of oospores were produced in vitro on a variety of culture media testes particularly the Rye A and V8 Juice.

Summary in arabic.

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