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 dark 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, yellow-green body and sparse white fine hairs on the side and back. The pupa is flat-ovate, about 8-10 mm long, with a light yellowish brown head and chest and a yellowish green abdomen. A black line is visible on the body, and it is brown in the later stage. Its pupa is often covered with oval flat light brown cocoons.
Occurrence and harm: big leaf yellow poplar, silver edge yellow poplar, golden heart holly spear, Fufang vine and silk cotton wood and so on. The worm produces one generation a year. The eggs hatched from the end of March to the beginning of April in the following year, and the larvae had the habit of causing damage in clusters. From the end of April to the beginning of May, the larvae matured, formed cocoons and pupated in shallow soil, and pupae passed the summer. The adults emerged in the first ten days of November and laid eggs after mating. The eggs were laid on the branches and overwintered with eggs. It uses larvae to feed on host leaves, and when serious occurs, it eats light on leaves, which affects the normal growth of plants.
Prevention and control methods:
1. Strengthen the maintenance and management and cut off the branches with eggs.
2. Trapping and killing adults with black light.
3. 1500-fold liquid of rice was sprayed at the peak stage of damage to the larvae.
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Occurrence and control of Populus tomentosa
The big-leaf yellow spot moth belongs to Lepidoptera and Lepidoptera. The insect harms the tender shoots of the tender leaves of the host with larvae, nibbling away at the leaves, forming bald branches and rods in serious cases, and even causing the whole piece to die. Plutella xylostella occurs one generation a year in Jining area, overwintering with eggs on the shoot of the host. The hatching time of overwintering eggs is mostly in the middle or late March, and the leeward and sunny places can hatch 5-7 days earlier, generally reaching the hatching peak around March 20, and the same egg block can be hatched in 2-3 days, when the new leaves of Euonymus tomentosa are pulled out. From late April to early May, the old and the young
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Control and identification of white silk disease of Populus tomentosa
The occurrence of white silk disease of Populus tomentosa is caused by fungi, which is destructive and spreads rapidly. if it is not controlled, it may lead to the death of all seedlings. According to the previous work, we summarized the characteristics and control methods of white silk disease of Euonymus tomentosa. Symptoms: at the beginning of the disease, the stem or leaf base turned brown and rotted near the soil, and after several days of sunlight exposure, white silk-like mycelium appeared on the disease part and soil surface, which spread radially in the rhizosphere soil, and brown grew on the near-surface stem in the later stage. Rapeseed sclerotia often causes death of the whole plant.
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