Green peach aphid

At the same time, photosynthesis in the leaves is reduced, affecting production. The aphid’s saliva can induce strong “allergic” reactions such as ma [...] the young aphids are born as developed nymphs. They immediately start to feed on plant sap and grow rapidly. When reproduction is sexual, the aphids lay

Pierce's disease of grapevine

infected and healthy trees. Normal fruit abortion does not happen so total production remains similar, with more smaller fruits in infected trees. The infected [...] The bacteria are transferred from plant to plant by all kinds of xylem-feeding insects. Well known, but certainly not the only vectors are sharpshooter [...] Oncometopia nigricans . The insects become infective immediately after feeding on infected plants and mature insects stay infective indefinitely. However

Powdery mildew

Podosphaera, Oïdium, Leveillula ) are all biotrophic fungi, meaning they feed on living plant cells and barely survive in the absence of a living crop [...] relative humidity (RH) promotes germination of spores but inhibits spore production, so the net effect of the RH is very small. Wind and draught in greenhouses