جستجوی مقالات مرتبط با کلیدواژه "متعارض" در نشریات گروه "زیست شناسی"

Damping-off is an important disease of cucumber in Iran. Greenhouses cucumber production were visited in Kohgiluyeh and Boyer-Ahmad Province, in south-west Iran, and sampled from infected seedlings to evaluate the appropriate biological control method for the disease. The pathogens were isolated and purified from infected tissues of the seedlings, and their morphological characteristics were studied and Phytophthora capsici and Phytophthora megasperma were known. One hyper-virulent isolate of each pathogen was selected from nine isolates after the pathogenesis test, and were subjected to hyper- parasitism and dual-culture tests against 20 Iranian isolates of Trcihoderma harzianum. All isolates of this fungus had the potential for hyper-parasites of the pathogens. They also showed a significant inhibitory effect on colony growth of pathogens from 26.4 to 73.03 percent in dual-culture. Then, ability of five superior isolates of T. harzianum was tested in controlling cucumber damping-off disease caused by the hyper-virulent isolates of the pathogens in greenhouse. All isolate of            T. harzianum were able to significantly reduce the disease severity, and two isolates controlled the disease without significant differences with healthy control. The efficacy of Iranian isolates T. harzianum in the biological control of this disease is reported for the first time.