This kind of insect "nesting and nesting" is very obvious, as long as there is this kind of insect harm, you will find this situation, what is the insect, after many aspects of learning, found that this is a kind of harm called camphor nest borer, then how to control this insect pest, the following first understand the characteristics of the hazard and the law of occurrence, to do a good job in prevention and control to lay a good foundation.
[1] Hazard characteristics of camphor nest borer
Camphor nest borer feeds on camphor tree leaves as larvae. 1-2 instar larvae feed on leaves, and 3-5 instar larvae spit silk to conjure up twigs and leaves to form a bird's nest-like nest. It is mainly harmful to large camphor trees along highways, parks and courtyards, especially for young camphor saplings, and the larvae cluster on the new shoots to feed on the leaf buds.
Chapter nest borer mainly with larval leaves to nest, in the nest to feed on the leaves and young shoots, in severe cases will eat the camphor leaves exhausted, the canopy hung a number of bird's nest-like insect buds, affecting the growth and ornamentation of camphor trees, and even death, affecting the greening effect.
[2] Occurrence law
Two generations occur a year, with larvae overwintering in the underground soil cocoon, pupating in late April to early May in the following year, feathering in mid-to-late May, the first generation of larvae from the end of May to mid-July, the second generation of larvae from August to September, october to November under the tree into the soil cocoon overwintering. Adults feather at night, no phototropism eggs are laid between two overlapping leaves, larvae are 5 years old, and hatching larvae are clustered to harm and feed on leaves. Only the epidermis remains, which is easily recognizable to the naked eye. As the insect body grows, the nest is divided into pests, each nest has 5-20 insects, and there are long strips of cocoon bags in the nest at the 5th instar stage, 1 larvae per bag, hiding day and night, agile movement, and the seriously damaged trees are full of insect nests.
The larvae are clustered, and the leaves are often nestled with silk leaves, which are infested internally. The hazard area ranges from one to dozens of nests per plant.
[3] Prevention and control measures
1, artificial control measures: the larvae have formed a nest, can be manually removed and burned. Combined with winter reclamation to eliminate overwintering cocoons.
2. Biological control: Spray 1000-1500 times 50000 IU/mg Officinalis susochen bacteria in the larval stage of a generation in June, and the spraying time should be in the evening or cloudy day on a sunny day.
3. Chemical control:
(1) Spray control: try to choose to control at a young larval stage. At this time, the insect population density is small, the harm is small, and the insect resistance is relatively weak. When controlling, the larvae are killed with a net spray of tree insects or a net spray of forest insects, which can be used 1-2 times in a row, with an interval of 7-10 days. Medications can be rotated to delay the development of resistance. When controlling, in view of the harmful characteristics of curly leaves, it is necessary to focus on spraying pest hazards to ensure the efficacy of the drug.
(2) Root drug control: You can use Qilin root application products - eradication net root application to prevent the occurrence of insect pests in advance.
4. Physical control: adult insect feathering period at night hanging black light or frequency vibration insecticidal lamp to trap adult insects.
