What is an orange aphid?

Another name

Orange flies, insects, insects, etc.

Form (Figure 4- 18)

Fig. 4- 18 orange aphid

Parthenocarpy with wings: 1. Women with wings ii. Antenna ⅲ3. Females without wings: 4. Female without wings 5. Newborn nymph 6. Antenna 7. Beak tip 8. Chest and abdomen basin 9. Suffix 10. Abdominal canal 1 1. Suffer.

The wingless parthenogenetic aphid is oval, 2.0mm long and 1.3mm wide. The body is black, shiny and sometimes brown. The compound eye is red and black, the antenna is grayish brown, and the abdominal tube, tail plate, tail plate and reproductive plate are black. The beak is thick and black, reaching the basal segment of the hind foot or exceeding the basal segment of the middle foot. The valve opens from a circle to a rectangle, and the valve plate is slightly prominent and black. Internodal spots are black. There are clear reticulation on the body surface, the reticulation on the back is nearly hexagonal, the reticulation on the abdomen is horizontal and long, composed of micro-spines, and the epidermis on the abdominal edge has micro-serrations. Marginal tumor is located in the thoracic and abdominal 1 and 7 segments, which is papillary and has the same length and width. The middle thoracoabdominal branch has a short handle. The hair on the back of the body is sharp, with 4 hairs on the top and 6 hairs on the back of the head; 2 hairs in the middle, side and edge of the chest; The first to eighth abdominal segments have 2 hairs, the second to fourth abdominal segments have 2 hairs on each side, and the segments 65438 and 5-7 have 1 hair. The middle part of the forehead is slightly raised, and the tumor in the forehead is extroversion. The antenna is corrugated, with a length of 1.7 mm, and the abdominal cavity tube is cylindrical, with a length of 0.36mm, consisting of small spikes. The tail is conical, with a length of 1.4 times the base width and 29-32 long hairs. The tail plate has a round end with 28-29 long hairs. There are more than 40 long hairs on the reproductive plate. The winged parthenocarpy fruit is oval, 2.65438 0 mm long and 65438 0.0 mm wide. The head and chest are all black, there is a thin horizontal band on the back of the first abdominal segment, and there are 1 pairs of big green spots in the third to sixth segments respectively, and there are big posterior points and small anterior points in the abdominal cavity. The antenna is black, with a length of 1.8mm, and there are1-17 small circular secondary sensory circles in the third section. The wing vein is brown, the middle vein of the front wing is divided into three branches, and the wing nevus is light yellow. The tail piece is long and tapered, and the middle part is contracted, 19-30 hairs; The tail plate has 22-27 hairs. The wingless male aphid is similar to the wingless solitary aphid, with a dark brown body, a particularly enlarged tibial segment of the hind foot, and only 1 sensory circle at the end of the fifth segment of the antenna. The winged male aphid is similar to the winged solitary aphid, except that there are 45 sensory circles in the third quarter, 27 in the fourth quarter, 14 in the fifth quarter and 5 in the sixth quarter. The egg is oval, pale yellow at birth, and then gradually turns black, about 0.6 mm long. If insects have dark brown bodies and red and black compound eyes, they can be divided into winged and wingless ones. At the third and fourth instars, winged buds have grown, which are khaki in color and can reach 2.2 mm in length at the last instar.

Life history and habits

After the damage caused by the orange aphid, the leaves atrophy and can't stretch, and a large amount of honey dew is secreted on the twigs and leaves, which leads to the serious occurrence of soot disease, which leads to the poor growth of citrus reticulata and affects the yield. The orange aphid often lives with ants. The occurrence and severity of insect pests vary with region, year, rainfall and temperature. The weather is dry and the temperature is high, and the occurrence of orange aphid is early and serious; On the contrary, too much rain, too low or too high temperature are not conducive to the occurrence of orange aphids. Zhejiang, Hunan, Jiangxi, Sichuan and other places have exceeded 10 generation; Fujian, Guangdong, Guangxi, Taiwan Province, Yunnan and other orange areas have more than 20 generations. Huangyan, Zhejiang and Jintang, Sichuan mainly overwinter with eggs on branches; Guangdong, Fujian, Guangxi and Taiwan Province provinces mainly overwinter as adults. From late March to early April, overwintering eggs hatch into wingless aphids, which feed on the new branches, shoots and leaves of citrus, causing reproductive harm. If aphids are mature, they will start to give birth to young aphids and continue to reproduce, and the population will increase sharply, reaching the peak before the new leaves in spring shoots mature, which will harm the tender shoots and young fruits in June. In August and September, the buds of autumn shoots are damaged, which affects the next year's yield. Spring, summer and early autumn breed fastest. The optimum breeding temperature is 24-27℃, which leads to high mortality, short life and low fertility. Therefore, the orange aphid is the most prolific and harmful in spring and autumn. After several generations of wingless viviparous, if the environmental conditions are not suitable, especially when the branches and leaves are mature or the insect population density is too high, winged aphids will be produced, and they will migrate to other plants to continue their reproduction. Young aphids like to live in groups. The nymph molts 4 times and becomes an adult. It takes 5.5-4 1.9 days to breed one generation, with an average of 10.6 days. The life span of adults is generally 5.7-28.5 days, and the longest is 49 days. Each female aphid can produce 5-68 young aphids, up to 93 at most. The winged female aphid and the winged male aphid occurred in late autumn and early winter of 165438+ 10, and laid eggs on branches after mating. In Guangdong, Fujian, Taiwan Province, Guangxi, Yunnan and other citrus producing areas, the insect occurs all year round. Most of them are wingless aphids in February and March, except wingless aphids, winged aphids often occur in April, May, August and September.

The natural enemy of orange aphid is the same as Spiraea aphid.

Prevention and cure method

The favorable opportunity for chemical control is to use chemicals to pick and control central insect plants when spring shoots and buds appear sporadically in early and middle April. If there are insect branches on the summer and autumn shoots, apply high-concentration chemical solution to smear or erase the premature branches. See Spiraea Aphids for other measures and methods.