The harm of spotted wax cicada on grapevine and its control

The harm of spotted wax cicada on grapevine and its control

Spotted wax cicada, also known as Chunpi wax cicada, spotted wax cicada. It belongs to Homoptera Cicadellidae. It is widely distributed in Liaoning, Shandong, Henan, Shanxi, Shaanxi, Gansu and other provinces. There is a wide range of hosts, not only harmful to grapes, but also harmful to four seasons begonia, peach, pear, pomegranate and other tree species. In recent years, with the rise of ecological gardens, the harm of spotted wax cicada on grapes is becoming more and more serious.

1 harm

The adults and nymphs cluster on the back and tender shoots of the leaves (figure 1), sucking the sap in the young shoots and leaves, and the injured leaves have yellowish spots. The surface of some leaves is covered with black mildew layer caused by thick sap infected by miscellaneous bacteria. Due to the absorption of grape sap, the growth and development of the plant was affected, and the epidermis withered and cracked seriously.

Fig. 1 nymph damage

2 morphological characteristics

2.1 Adult

The body length is 1520 mm, the wingspan is 40mm and 50mm, and the wing is covered with white wax powder. Head upward, antennae 3-segmented, setose, red, base dilated. The front wing is leathery, the base is grayish brown, there are about 20 black spots, the end is black, the vein is light, the hindwing base is red, there are about 8 black and brown spots, the middle is white and transparent, and the end is black (figure 2).

Fig. 2 adult worm

2.2 eggs

Oval, about 3 mm long, brown, shaped like wheat grain, covered with white wax powder.

2.3 nymph

It is like an adult with a long head and feet and a flat body. it is white when it hatches and then turns black. There are many white spots on the body surface. The back of the four-year-old body is red, with black and white spots [Yoshima Hua Yao].

3Life history and habits

There is one generation in a year. Overwintering with egg blocks on the trunk or frame of grapes. After the middle of April of the next year, they hatched into nymphs one after another, and the nymphs harmed the tender stems and leaves and jumped to escape when they were disturbed. The adults appeared in the middle of June and mating and spawning in August until late October. Generally, an egg block has 40 to 50 eggs, which are arranged neatly and have wax powder on the surface.

4 methods of prevention and control

4.1 Agricultural control

Wax cicadas such as Toona sinensis and neem are not planted around the vineyard to eat their hosts in order to reduce the source of insects and reduce the harm.

4.2 physical control

Combined with cleaning the garden in winter, remove the egg block with a steel brush (figure 3, figure 4).

Figure 3 before brushing

Figure 4 after brushing

4.3 Chemical control

During the peak period of nymph occurrence, 2.5% (mass fraction) cyhalothrin 1000 times was sprayed on the leaves.