Effect of Benomyl and Metalaxyl on reproduction of the plant parasite (Pythium Deliense) and the mycoparasite (P. Oligandrum)

Author： Abdelzaher Hani   Shoulkamy Mahmoud   Yasser Manal  

Publisher： Taylor & Francis Ltd

ISSN： 0323-5408

Source： Archives of Phytopathology and Plant Protection, Vol.37, Iss.4, 2004-11, pp. : 307-317

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Abstract

Benomyl did not inhibit the growth of isolates of Pythium deliense and Pythium oligandrum but at concentrations of 10 ppm benomyl slightly inhibited the growth of P. oligandrum. Isolate of El-U002A of P. oligandrum was more sensitive to benomyl than the isolate El-U002B. Metalaxyl inhibited the growth of all pythia studied starting from 2 ppm and completed at 10 ppm. All concentrations (2, 5 and 10 ppm) of metalaxyl caused a decline in the mycelial dry weight but the degree of this decline was more pronounced at high concentrations of the fungicide for P. deliense while all concentrations of metalaxyl inhibited the growth of P. oligandrum. Benomyl did not effect the mycelial dry weight for all the pythia investigated. Zoospore production of P. deliense was generally high after 24 h incubation at 25°C. Water amended with 2, 5 and 10 ppm benomyl did not affect the two isolates tested. On the other hand, metalaxyl inhibited zoospore production of P. deliense at all concentrations studied especially the higher ones. Zoospore production of P. oligandrum appeared in the same manner as P. deliense but high concentrations of benomyl decreased zoospore production. Oospore production of P. deliense was not affected with 2, 5 and 10 ppm benomyl by the two isolates tested. On the other hand, metalaxyl inhibited oospore production of P. deliense at all concentrations studied especially the higher ones. Oospore production of P. oligandrum appeared in the same manner as P. deliense but high concentrations of benomyl decrease oospore production.

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