Studies on Prolonged Storage of Beauveria bassiana Conidia: Effects of Temperature and Relative Humidity on Conidial Viability and Virulence against Chickpea Borer, Helicoverpa armigera
Titel:
Studies on Prolonged Storage of Beauveria bassiana Conidia: Effects of Temperature and Relative Humidity on Conidial Viability and Virulence against Chickpea Borer, Helicoverpa armigera
Auteur:
Sandhu, S. S. Rajak, R. C. Agarwal, G. P.
Verschenen in:
Biocontrol science and technology
Paginering:
Jaargang 3 (1993) nr. 1 pagina's 47-53
Jaar:
1993
Inhoud:
Unformulated conidia of Beauveria bassiana were stored at five different temperatures (0°, 10°, 20°, 30° and 40°C) at six different relative humidities (RH) (0, 33, 53, 75, 85 and 98%). Conidial viabilities and virulence against third instar larvae of Helicoverpa armigera were determined over a 24-month period. Conidia survived longest at lower temperatures (0-20°C) and lower RH levels (0-53% RH). At higher temperatures (30-40°C) conidia did not survive. When the temperature was decreased from 30°C to 0°C, at nearly all RH levels the longevity of conidia increased. Conidia remained virulent for third instar larvae of H. armigera under favourable storage conditions for 24 months.