Cotton aphid characteristics of flower aphids, symptom characteristics of flower aphids and cotton aphid morphology

Among the common insect pests of flowers, the harm of cotton aphid is very great. Let's take a look at the harmful habits and forms of cotton aphid.

For harmful habits: cotton aphids are common aphids in general herbaceous flowers, which occur on plant buds, young leaves, or buds and Corolla, and often gather in groups because of their rapid reproduction. When the nymph is the fourth instar, it takes only 5 days for the wingless fetus to complete the development of the first generation at 25 ℃, and it takes about two weeks to complete the first generation when the temperature is low in winter on the plains. Dry weather is suitable for aphid growth and reproduction, which is more common in spring and autumn. Because of shelter in greenhouse, the occurrence is often more serious than that in open field. Damage to roses, African chrysanthemums, lilies, carnations, carnations, hibiscus, etc., but also the main damage to cruciferous vegetables, beans, melons, ​​ insects, in addition to direct smoking, but also spread virus diseases.

Shape: the body of the wingless worm is 1.5 mm long. the color of the worm varies with the host and season, and may be dark green, green or yellowish. The ventral canal is black, the end of the tail is obtuse, the middle is small, hairy 5-7 branches. The body of the winged viviparous adult is black, and there are 3-7 parasensory organs in the 3rd segment of the antennae, while there are no accessory sensory organs in the 4th and 5th segments.