Der Einfluß der Blattisolierung und der Kinetinbehandlung abgeschnittener Blätter auf das Wachstum von Blattläusen

Abstract

On the development and weight of Myzus persicae feeding on leaves of Chenopodium quinoa by different means

Individuals ofMyzus persicae feeding on detached yellowing leaves ofChenopodium quinoa became four times heavier than those feeding on attached leaves. If the detached leaves were treated with kinetin by spraying, the weights of the adults decreased about 25% as compared to those feeding on detached yellowing leaves treated with water. The resistance of the attached leaves was not restored completely by kinetin-treatment of detached leaves which remained green, however.

More aphids survived, if they were placed on the detached leaves as 0–1 days old larvae. Detaching of leaves, however, did not lead to a decrease of the resistance ofCh. quinoa to adults ofMyzus fersicae bred onSinapis alba. Adults could neither be settled on plants of Ch.quinoa nor on detached yellowing leaves. Apparently, there exists another type of resistance which cannot be influenced by detaching leaves.