The effect of acceleratedelectronswith an energy of 1mevon the growth of agriculturalplantspathogens

It was shownthaton the third day aftersowingon the nutrientmedium of die-cutsfromirradiated low-energyaccelerated electronswith a maximum energy of 1MeVin the doserangefrom100 Gy to10000 Gy mycelialmat of fungi of variousstrains of the genera Fusarium and Alternaria, the greatestsuppression of the growth of mostfungi was observed whenir radiated at dose sfrom 5000 Gy and above. On average, the smallest growth of fungi was observed at a dose of 5000 Gy. In this case, the average colony diameter of the studied strains was 9.7 mm, which is 74.6% less than in the control samples. It is shown that electron beam treatment ledto a decrease in the diametricalgrowthrate for7of the 12 studiedstrains of phytopathogens. Irradiation of mycelium of fungi of variousstrainsat doses of 100, 1000 and 10000 Gy suppressed theirgrowthby 4-10, 13-39 and 62-63 %, respectively, dependingon the type of fungusanditsstrain. Fordosedependences of colonydiameters of strainsG-4andK-91Fusarium spp., TAN-1 Alternaria spp., T-1 and T-2 B.sorokiniana and SHK-25 and SHP-28 R.solani, explicit approximating sigmoidal dependen ceswereobtained, indicatingdifferentradiosensitivity of strains of phytopathogen icfungidue to theirmorphologicalfeatures. The most radiosensitive strain was SHK-25 (R. solani), the inhibition of colony growth of which was observed when irradiated at a dose of 1000 Gy. The least radiosensitive strains were TAN-1 (Alternaria spp.), S-1 (S. nodorum) and K-7.2, K-21 and K-37 – Fusarium spp., whose growth inhibition was not observed even when irradiated at doses of 10000 Gy.