Occurrence and control of Populus tomentosa
Euonymus spot moth, belongs to lepidoptera, spot moth family. The insect damages the tender shoots of the host leaves with larvae, nibbles the leaves, and forms bald branches and bare rods in severe cases, even causing the whole leaf to die.
Euonymus euonymus has one generation a year in Jining area and overwinters with eggs on host branches. The incubation time of overwintering eggs is mostly in the middle and late March, and the early incubation time is 5~7 days in the leeward sunny place, and the incubation peak is generally reached on March 20. The same egg mass can be hatched in 2~3 days, when the new leaves of Euonymus japonica are extracted. From late April to early May, mature larvae begin to cocoon and pupate, mostly concentrated in the soil crevices around the rhizosphere about 5 cm above the ground or in the dry weeds, and spend the summer as pupae. The pupal stage can last for half a year.
Adult emergence time is about in the middle of October, generally at the end of October to reach the peak of emergence.
The following prevention measures can be taken:
1. Artificial control Because overwintering eggs are mostly attached to the top of fresh branches of the year, the green belt can be combined with pruning before winter every year to prevent and eliminate eggs, cut off branches with eggs and eliminate eggs.
2. Pesticide control Because the host of Euonymus sphaerocephala is mostly green plants, the use of highly toxic pesticides should be prohibited. In recent years, we have carried out control experiments with pyrethroids pesticides with high efficiency and low toxicity. The results show that at the early stage of larva emergence, i.e. from the end of March to the beginning of April every year, the application of 3000 times diluted solution of 5% fenpropathil EC or 5% kungfu EC evenly sprayed on the center and surrounding branches has a control effect of about 98%. Other pyrethroids pesticides such as 20% fenpropathil EC and 20% sumiding EC can also achieve good control effects.
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Diseases and insect pests of Euonymus tomentosa and its control
As an evergreen shrub, Euonymus tomentosa is one of the most commonly used greening plants in urban streets, squares, parks, unit courtyards and residential green spaces. Because of its different growth environment and extensive management measures, the occurrence of diseases and insect pests is also serious, which seriously affects the urban greening landscape. To investigate and study the occurrence characteristics of main diseases and insect pests of Euonymus tomentosa, the prevention and control measures can be formulated and implemented according to local conditions, so as to control the harm and beautify the environment. 1. Occurrence characteristics of main diseases and insect pests (1) powdery mildew of Euonymus tomentosa. Powdery mildew is a big leaf.
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Populus tomentosa
Scientific name: PryeriasinicaMoore morphological characteristics: the adult is about 12 mm long, the wingspan is about 30 mm, the head, chest and antennae are black-brown, the antennae of male moths are feathery and the antennae of female moths are pectinate. There are orange long hairs on both sides of the chest, back and abdomen, and the front wings are translucent, but the wing base 1 and 3 are yellow, the rest are dark gray, the veins of the wings are dark brown, and the background of the hind wings is yellow. The egg is oval and flat, yellowish white at first birth, and then light brown. The larva is about 20 mm long, with a small head, dark brown, yellowish green and white on the side and back.
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