Effect of the entomopathogenic fungi Metarhizium anisopliae and Beauveria bassiana on eggs of Rhipicephalus sanguineus (acarlixodidae)

Ciência Rural

Faccini, João Luiz Horácio²  Bittencourt, Vânia Rita Elias Pinheiro¹  Daemon, Erik¹  Monteiro, Sílvia Gonzalez² 

[1] Universidade Federal Rural do Rio de Janeiro, Seropédica, Brasil;Universidade Federal Rural do Rio de Janeiro

关键词: : Rhipicephalus sanguineus;    Beauveria bassiana;    Metarhizium anisopliae;    entomopathogenic fungi;    microbial control;   

DOI  :  10.1590/S0103-84781998000300018

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

This experiment was conducted to evaluate the effects of two species of fungi Beauveria bassiana and Metarhizium anisopliae on the eggs of the tick Rhipicephalus sanguineus at constant (27 ± 1° C and > 80% RH) and variable (25 ± 5° C and > 60% RH), temperatures and humidities. Eggs of R. sanguineus were immersed in four concentrations (108, 107, 106, 105 conidia/ml) of two isolated of B. bassiana (Bb 986 and Bb 747) and three isolated of M. anisopliae ( Ma 959, Ma E9 and Ma 319). The incubation and hatch periods of all treated eggs and controls were statistically not significant (P> 0.05). Otherwi- se, the percentage of hatch of larvae in all treated eggs was inversely proportional to the concentration of conidia/ml. The percentage of hatch ranged from 0 to 26.66% for the 108 concentration and from 6.66 to 100% for the 105 concentration. The percentage of eclosion of eggs maintened at variable temperatures and humiditis were lower as compared with eggs maintened at 27 ± l° C and > 80% RH (P< 0.05). The DL 50 and 90 for inhibicion of eclosion of larvae were also lower at variable temperatures and humidities (P<0.05).

【 授权许可】

CC BY-NC