Susceptibility of the legume flower thrips to Metarhizium anisopliae on different varieties of cowpea |
| |
Authors: | S Ekesi NK Maniania W Lwande |
| |
Institution: | (1) The International of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya;(2) The International of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya (author for correspondence) |
| |
Abstract: | The susceptibility of Megalurothrips sjostedtito Metarhizium anisopliae when reared on susceptible, tolerant, and moderately resistant varieties of cowpea at different constant temperatures was
evaluated in the laboratory. Insects were exposed either to direct spray of the conidia or to fungus-treated floral tissues.
Mortality was significantly higher on the moderately resistant variety at all temperatures compared to the susceptible and
tolerant varieties. Correspondingly, lethal time and lethal concentration values were significantly shorter and lower, respectively,
on the moderately resistant variety compared to the other varieties, thus indicating that the two control methods are compatible
as part of an integrated pest management strategy. Thrips raised on the tolerant variety incurred an exceptionally low level
of mortality when the inoculum was sprayed directly on the insects or when the insects were exposed tofungus-treated floral
tissues. Observations on the effects of airborne volatiles and crude extracts of this variety revealed an inhibitory effect
on fungal germination, colony forming units and growth. This suggests the existence of anti-fungal substances in the tolerant
variety.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
Keywords: | anti-fungal substances control host plant resistance Megalurothrips sjostedti temperature |
本文献已被 SpringerLink 等数据库收录! |
|