hymenopus coronata
Conrad Bérubé
island crop management
email: uc779(at)freenet.victoria.bc.ca
hymenopus coronata
Copyright © 2007 Conrad Bérubé, site design, concept and scripting. All rights reserved worldwide.


Aphids

APHID
The GPA is very characteristic dirty green with black bands on the back in its alate form. The non-alates are less easy to distinguish varying from light green to pink. Population peaks in the beginning of August. Leaf- roll virus is vectored by GPA and can be very devastating. Lemon (or cotton) aphid on middle leaves can also transfer viruses. Sources of leaf- roll virus can be: volunteers, cull piles (main source), backyard gardens, PLRV-infected seed. High aphid populations (as when they build up on sugar beets) assist in vectoring the pathogen. Control strategy: plant certified seed, control volunteers, establish aphid threshold (based on seed source, presence of volunteers, region, annual expert consulting), the use of geographic information systems.

Potato aphids are a little longer, have a more elongate abdomen and has cornicles that run more parallel when compared to the GPA. PA also tends to inhabit the upper sides of leaves and GPA the undersides.

Aphidius parasitoids have some impact on aphids, syrphid fly larvae can take out a dozen per day as can large coccinellid larvae and adults.

Copyright © 2007 Conrad Bérubé, site design, concept and scripting. All rights reserved worldwide.
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