Effect of temperature on Paecilomyces lilacinus culture characteristics and its toxicity to Ditylenchus destructor

In this paper,the effect of temperature on Paecilomyces lilacinus growth was investigated.The growth index for OD,pH,mycelia dry weight,and spore number and their toxic effect on nematodes at different temperatures (15～35℃）were analyzed.Results show that temperature is a key factor of fermentation.Paecilomyces lilacinus exhibits normal growth within 20～30℃，optimum mycelia growth and sporulation occur at 25℃,mycelia biomass reaches 1.08g in 9 days,spore number reaches 4.012×10⁶/mL in 10 days.Between 15～30℃，higher temperatures can increase C and N consumption and toxin production.At 30℃,cultured 7d,the toxicity to Ditylenchus destructor can reach 64.60%.