Utilização de fungos entomopatogênicos para o controle de Orthezia praelonga (Sternorryncha: Ortheziidae). / Utilization of entomopathogenic fungi for the control of Orthezia praelonga (sternorryncha: ortheziidae).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The pathogenicity was evaluated for 50 isolates of 8 species of entomopathogenic fungi and the commercial product Boverilâ, composed by the isolate ESALQ-447 of B. bassiana for nymphs of 2 and 3 instar of Orthezia praelonga. In another experiment the production of the isolated was selected in two production systems. In the selection tests, seedlings of citrus infested by the scale were used. The pathogen was inoculated pulverizing 5 ml of conidial suspension by seedlings, with a concentration of 1 x 108 conidia/ml, using a pulverizer with constant pressure of 0.5 lbs/second. The seedlings were kept in B.O.D. (25±0,5°C, 70±10% UR and 12 hours of photophase). From the isolates tested, 30 were pathogenic to the scale causing corrected mortality that varied from 1.0% to 46.6%, while the best results were obtained with the isolates ESALQ-972 and ESALQ-1300 of V. lecanii which generated 46.6% e 40.5%, respectively, after 12 days of aplication. For the production tests two methods were utilized. The tray method, which used the pre-cocked rice, sterilized and inoculated with fungus in plastic trays, with a production cicle of 15 days. In the other method, a plastic box was used, containing a water blade in the bottom and a constant ventilation system to provide positive pressure and keep the environment with humidity above 90%. The isolate tested was the ESALQ-972, resulting that the tray and the plastic box methods produced 1.88 x 109 and 1.0 x 109 conidia/gram of rice, respectively.

ASSUNTO(S)

citrus biological industrial scale entomopathogenic fungi fungos entomopatogênicos controle biológico cochonilhas inseticidas biológicos citricultura

ACESSO AO ARTIGO

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