Greenbug – Schizaphis graminum

Schizaphis graminum

Schizaphis graminum


Globally widely spread insect, the greenbug can be found in Europe in all areas of small-grain cereal crops, being the most damaging pest species of these crops.


The wingless forms have oval bodies, 1.5-2 mm long, light green or yellowish-tint coloured. The alate forms have 1.2-1.9 mm long bodies, dark head and thorax and green abdomen.

Schizaphis graminum - adult

Biology and Ecology: 

Species which hibernates as a resistance egg laid by females during autumn, in wheat, oat, sorghum, corn or other spontaneous grasses. One female lays 1-6 eggs. In Romania, the species develops 21-23 generations per year.

Schizaphis graminum - larvae

Affected Plants and Damage:

It attacks cultivated grasses, especially wheat and oat, by colonising leaves, but it also attacks spontaneous grasses. Due to the attack, the leaves get contorted, and reddish spots appear in the pricked areas, which then get larger, gradually spreading on the entire leaf. This ultimately leads to plant drying.   

Schizaphis graminum - affected plant

Schizaphis graminum - affected leaf 

Prevention and control

Chemical treatments with Actara (0.7 kg/ha), Kaiso Sorbie (0.15 kg /ha), Mavrik 2F (0.2 l/ha).

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