A Guide to Grapevine Abnormalities in South Africa - P.G. GOUSSARD

Mealybugs as vectors for leafroll.

PHOTO 194. The occurrence of mealybug with tiny bugs below the bark sections of leafroll infected grapevines. A similar situation can also occur on grapevine roots. Note the protective actions that ants are able to exercise at this stage to protect mealybug against natural enemies.

PHOTO 195. Mealybugs do not practice birth control and even at a very early stage the masses of little bugs are able to operate as highly successful vectors for spread and reinfection of leafroll.

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