Die Russiese koringluis, Diuraphis noxia (Mordvilko) (Hemiptera: Aphididae) : voorkoms, skadelikheid en ekonomiese drumpelwaardes vir chemiese bestryding in die Oos-Vrystaat

Du Toit, F (1986)

Proefskrif (Ph.D. Agric.) -- Universiteit van Stellenbosch, 1986.

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Thesis

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