Effect of soil temperature and moisture on the pathogenicity of two species of entomopathogenic nematodes (Rhabditida: Spteinernematidae)
2010
Radova, S.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Katedra Rostlinne Vyroby a Agroekologie | Trnkova, Z.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Katedra Rostlinne Vyroby a Agroekologie
This study investigated the impact of soil temperature and soil moisture on the virulence of the entomopathogenic nematodes Steinernema carpocapsae and S. feltiae. The effects of temperatures of 10, 15 and 25 deg C and humidity of 6% and 12.5% were tested against the larvae of Tenebrio molitor. The nematodes were tested in two concentrations of 50 nematodes and 500 nematodes per box. S. carpocapsae was generally significantly more efficient at the highest temperature than S. feltiae. S. feltiae recorded higher insect mortality at lower temperatures. The virulence of both tested nematode species was low (0-26%) at 10 deg C after 7 days, but in the case of S. feltiae increased to 66% after 14 days. The efficacy when tested with 6% moisture at 15 deg C was low (4% for both nematode species) compared with 12.5% moisture (54% for S. carpocapsae and 70% for S. feltiae after 7 days). Insect mortality increased significantly after remoistening of the soil, especially with S. feltiae (500 nematodes per box, mortality of 46% two weeks after remoistening).
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