Green corn aphid – pest management
Distribution. The green corn aphid (Rhopalosiphum maidis) is an insect widespread on the entire globe.
Description. The aptery forms have an elongated body, light green or light blue, 1.8-2.2 mm long. The length of the body is twice as big as the width. The winged forms are 1.7-2.2 mm long, with a black head and black thorax. The abdomen has shades of green and areas that are darker colored.
Biology and ecology. The number of produced generations can be between 9 and 45 or even 50 per year, in laboratory conditions.
Damage. The green corn aphid is a species that can be found on corn and other grasses (sorghum, wheat, barley grass) developing colonies on leaves, spikes, or panicles and possibly on corn cobs. Because of the way they feed (stinging and sucking the intracellular fluid from the attacked organs), the leaves of the attacked plants often twist in a conical shape, interrupting their normal development. Following the attack, an increased amount of carbohydrates accumulates in the leaves, followed by the synthesis of anthocyanin pigments (a characteristic phenomenon of the attack). As a result, the leaves or stems turn red.
Control. In order to control the corn aphids, it is recommended to carry out treatments with specific insecticides.
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