The role of Diaeretiella rapae (M'cintosh) (Hymenoptera: Braconidae) in the population control of the cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae) in Kenya

1986 ◽  
Vol 7 (05) ◽  
pp. 605-609 ◽  
Author(s):  
J. Bahana ◽  
G. Karuhize
Keyword(s):  
Population Control ◽  
Brevicoryne Brassicae ◽  
Diaeretiella Rapae ◽  
Cabbage Aphid

POPULATION DYNAMICS OF THE CABBAGE APHID, BREVICORYNE BRASSICAE (HOMOPTERA: APHIDIDAE) AT VANCOUVER, BRITISH COLUMBIA: V. A SIMULATION MODEL

1984 ◽  
Vol 116 (6) ◽  
pp. 895-911 ◽  
Author(s):  
D. A. Raworth
Keyword(s):  
British Columbia ◽  
Population Dynamics ◽  
Major Change ◽  
Brevicoryne Brassicae ◽  
Diaeretiella Rapae ◽  
Simulated Population ◽  
Aphidoletes Aphidimyza ◽  
Functional Responses ◽  
Cabbage Aphid ◽  
Effects Of Temperature

AbstractA computer model was written to simulate the population dynamics of the cabbage aphid, Brevicoryne brassicae (L.), on the host Maris Kestrel kale, Brassica oleracea L., at Vancouver, British Columbia. The model incorporated the effects of temperature, morph determination, plant quality, predators, parasites, and leaf fall. Comparisons of simulated results with field observations indicated that although B. brassicae, Aphidoletes aphidimyza (Rond.), and Diaeretiella rapae (M'Intosh) were reasonably well understood, syrphid predation was not, and appropriate feed-back mechanisms which could prevent monotonic increase or decrease in the simulated population were lacking. A detailed study in which the population dynamics of the prey is accounted for in terms of the numerical and functional responses of syrphid predators is necessary to understand the population dynamics of B. brassicae on Maris Kestrel kale at Vancouver. Comparisons with other aphid systems suggest that a major change in one component of the system can be compensated for by changes in other components. An overview of the cabbage aphid system at Vancouver is given.

REPRODUCTION AND LONGEVITY OF CABBAGE APHID, BREVICORYNE BRASSICAE (HOMOPTERA: APHIDIDAE), PARASITIZED BY DIAERETIELLA RAPAE (HYMENOPTERA: APHIDIIDAE)

1984 ◽  
Vol 116 (12) ◽  
pp. 1605-1610 ◽  
Author(s):  
M. Mackauer ◽  
S. Kambhampati
Keyword(s):  
Adult Stage ◽  
Variable Number ◽  
Reproductive Period ◽  
Brevicoryne Brassicae ◽  
Diaeretiella Rapae ◽  
Linear Regression Equation ◽  
Cabbage Aphid ◽  
Total Fecundity ◽  
The Mean ◽  
Cabbage Aphids

AbstractParasitized cabbage aphids, Brevicoryne brassicae (Linnaeus), produced fewer offspring than unparasitized aphids. Aphids parasitized by Diaeretiella rapae (M'Intosh) during the first, second, or third instar died before producing any offspring; those parasitized during the fourth instar or the adult stage produced a variable number of offspring. The aphid's survival time was correlated with the rate of development, as measured by the length of the pre-reproductive period. A multiple-linear-regression equation is provided for predicting the mean total fecundity of parasitized cabbage aphids from the host age at the beginning of parasitism and the pre-reproductive period.

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