MySheen

Occurrence and control of Populus tomentosa

Published: 2024-11-25 Author: mysheen
Last Updated: 2024/11/25, 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

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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