بررسی کنترل ایمن دو بیمارگر گیاهی Pythium aphenidermatum و Fusarium solani با ذرات نانونقره

Control of phytopathogens by Nanomaterials is a new subject in the area of plant diseases studies. Nanosilver as an antimicrobial material has been recognized since many years ago. Considering biosafety of nanosilver particles is important to reduce potential adverse effects on non target microorganisms and organisms. In this study, we tried to found suitable concentration of nanosilver particles toward control of two phytopathogenic fungi Fusarium solani and Pythium aphanidermatum. At first, two types of nanosilver (2 nm and 20 nm) with doses of 100 ppm up to 2000 ppm were studied and then low concentrations (0, 5, 10, 25, 50 and 75 ppm) of nanosilver particles were applied. Results showed that both of fungi were influenced by particle sizes at first experiment while at second experiment, they were affected by low concentration levels of nanosilver. Growth rate of both phytopathogenic fungi treated with 2 nm particles was inhibited more comparing to 20 nm particles. Increasing in concentration of nanosilver for both 2 nm and 20 nm particles could inhibit growth rate of Fusarium solani and Pythium aphanidermatum. The best dose to control Fusarium solani and Pythium aphanidermatum was recognised 10 ppm and 5 ppm of 2 nm particles, respectively.