ﺗﺎﺛﯿﺮ ﺑﻌﺾ اﻻوﺳﺎط اﻟﺰرﻋﯿﺔ ودرﺟﺎت اﻟﺤﺮارة ﻓﻲ ﺣﯿﻮﯾﺔ اﻟﻔﻄﺮ Beauveria bassiana (Bals.) Vuill. بعد ﻣﺪد ﺧﺰن ﻣﺨﺘﻠﻔﺔ

This study aimed to evaluate theeffects of interaction between differentstorage conditions ontheviability of Beauveriabassianaspores.The test interaction involvedincubating fungus spores infourmedia;Nutrient broth (NB), Potato extract dextrose agar (PDA), mixture of Wheat bran and corn cobs powder (WC) attheratio 3: 1supplied with distilledwater anddistilledwater only as control under different temperature degrees ; Refrigerator temperature degree 8-10 Cº, Freez temperature degree -20 Cº , Lab temperature degree 28±2Cº and Incubator temperature degree 35 ± 1 Cºafter three periods of storage ; one , two and three months.The results showed that the best period in which spores maintained their viability was one month of storage under different temperature conditionsin all media whereas the percentage of theviability was 56.4 –85.1% , the viability percentage was bestatrefrigeratorwere was70.8–85.1% , 51.3 –76.9% and 33.1 –55.7% after one , two and three months of storage respectively.The results also showed that the WC was the best medium to maintain the percentage of spore viability after three months of storage which was55.7%. Onthe other hand,thespore viabilityshowed sharp reduction afterthree monthsof storagein allmedia at differenttemperatures whereasthe percentage ofviability was 17.1 –55.7 %, at the second month a percentage of viability was 36.2–76.9%.