Desiccation increases the efficacy of Beauveria bassiana for stored-grain pest insect control

The effect of desiccation stress on the efficacy of Beauveria bassiana for controlling stored-product insects was investigated in laboratory bioassays. The mortality of B. bassiana-treated Plodia interpunctella larvae was greater at a vapor pressure deficit (VPD) of 2.42 or 1.87 kPa than at 1.06 kPa...

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Bibliographic Details
Published in:Journal of stored products research 2007, Vol.43 (4), p.535-539
Main Author: Lord, Jeffrey C.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Beauveria bassiana
Biological and medical sciences
dehydration (animal physiology)
Desiccation
desiccation stress
desiccation tolerance
entomopathogenic fungi
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Grain beetle
hard red winter wheat
Harvesting. Postharvest. Storage
Humidity
insect control
Invertebrates
Lasioderma serricorne
Medically important nuisances and vectors, pests of stored products and materials: population survey and control
mortality
Pests of stored products
Plodia interpunctella
Sitophilus
storage insects
stored product protection
vapor pressure
vapor pressure deficit
Vegetative propagation. Sowing and planting. Harvesting
water stress
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Summary:The effect of desiccation stress on the efficacy of Beauveria bassiana for controlling stored-product insects was investigated in laboratory bioassays. The mortality of B. bassiana-treated Plodia interpunctella larvae was greater at a vapor pressure deficit (VPD) of 2.42 or 1.87 kPa than at 1.06 kPa. Moisture also had significant effects on the mortalities of adult rice weevils, Sitophilus oryzae and maize weevils, Sitophilus zeamais. Mortality of S. zeamais was higher at 2.42 and 1.87 kPa than at 1.06 kPa, while mortality of S. oryzae was higher at 1.87 kPa than at either 2.42 or 1.06 kPa. Higher control mortality at the higher two VPDs indicated that S. zeamais was less desiccation tolerant than S. oryzae. The mortalities of B. bassiana-treated adult Cryptolestes ferrugineus, larval Lasioderma serricorne and larval Oryzaephilus surinamensis were not significantly affected by VPD. These results demonstrate that dry stored-grain conditions are favorable for B. bassiana efficacy.
ISSN:0022-474X
1879-1212
DOI:10.1016/j.jspr.2007.03.002