Acta Entomologica Sinica (1998) 41, 145-152
Mingguang Feng and T.J. Poprawski (1998)
[Interaction between the aphid-specific fungus Pandora neoaphidis and the pea aphid Acyrthosiphon pisum at regimes of varying temperature and photoperiod simulating variable seasonal patterns]
Acta Entomologica Sinica 41 (2), 145-152
Abstract: The interaction between the aphid-specific entomophthoralean fungus, Pandora neoaphidis, and the pea aphid, Acyrthosiphon pisum, was investigated in computer controlled growth chambers at regimes of varying temperature and photoperiod simulating different seasonal patterns in an attempt to reveal the potential preadapting behavior of the fungus for overwintering. Based on the fitting of the time-dose-mortality model to the experimental data, the time-dose effect pattern was found to be similar between the photoperiods of 16 : 8 and 11 : 13 (L : D) at 20°C, but was significantly different between the constant and daily varying temperatures (5.4~18. 9°C at the rate of 0. 56°C per 30 min) and also between the above photoperiods at the same varying temperature. With the varying temperature treatment, the mean incubation time of the fungus on the host (i.e., mean lethal time postinoculation) was 15.14 d for 8 h of light, 15.19 d for 9.5h, 11.79d for 11h, 13.33d for 11.5h, 11.73d for 12h, and 9.21d for 16h, respectively. This displayed a significantly negative correlation (a =15. 58, b = - 0.93, r2=0. 78, p<0. 01). However, the mean incubation periods were nearly identical for 11 and 16 h of light at 20°C (5.85 d and 5.97 d). Abnormal hyphal bodies of the fungus were not found during microscopic examination of all cadavers from all the regimes of temperature and photoperiod. The fungus maintained its infectivity to the host at all the regimes considered and had no preadapting behavior to overwintering. However, the short photoperiods were found to decrease the mean incubation time at the varying temperature that simulated a late autumn or early winter pattern.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Acyrthosiphon pisum | ||||
| Pandora neoaphidis (entomopathogen) | Acyrthosiphon pisum |
