THE Role of phenolic substances for host-selection behaviour of the black bean aphid, aphis fabae
1979
JÖRDENS-RÖTTGER, DAGMAR
Leaf surface extracts of host plants with and without phenolic substances were offered to apterous adult black bean aphids, Aphis fabae Scop. in a bioassay. Since they strongly preferred extracts containing phenolic compounds, thirteen low molecular phenols together with three common plant flavonoids were tested. The aphids showed most positive reactions to phenol, hydroquinone, guaiacol and dihydrocoffeic acid, whereas the flavonoids apigenin, luteolin and quercetin proved to be less attractive. The others had medium values. Results indicate that phenolic substances of low molecular weight may have an influence on host-finding behaviour of A. fabae. Since simple phenols in free form are very restricted in their distribution among plants, they could, as a group, serve as token stimuli for A. fabae.
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