عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Aspects of biology of common root lesion nematodes, Pratylenchus thornei and P. neglectus in the irrigated fields of wheat and corn of Marvdasht (Fars province) were studied under laboratory and greenhouse. Preliminary pathogenicity test of these nematodes on wheat, cultivar Falat, in irrigated and dry farming condition, with or without fertilizers were performed. In addition, the responses of common field crops of Marvdasht to P. thornei and P. neglectus were studied under greenhouse conditions. Moreover, the time it takes to complete the life cycle and temperature effects on laying eggs, hatching and the rate of reproduction of P. thornei were investigated.
The result of pathogenicity test showed that two species put the effect on growth indicators and yield of wheat, such as root dry weight, shoot fresh and dry weight, number of spikes and tillers of plants. Negative effects of nematodes on plant indices in treatments of dry farming and without fertilizers were more than the other are. Study of effects of different field crops under greenhouse condition showed that wheat, barely and rapeseed are sensitive to P. neglectus, and wheat and beans to P. thornei, and the nematode population were increased. While the nematode population decreased under tomato, sugar beet and fallow condition. Biology study of P. thornei in laboratory and growth chamber also showed that the best temperature for laying eggs, hatching and reproduction of this species is 25°C. In this temperature, the nematode life cycle was completed in a period of 25 to 26 days.