Gather the canopy caterpillars under the maple tree
2020 is destined to be extraordinary, after the impact of the new crown epidemic, due to the abnormal weather in the spring, a variety of caterpillars are stirring up all over the countryside. Especially under the maple tree, caterpillars in groups, gathered together, and even eat the leaves of the caterpillar, more or less affecting the lives of residents, making many farmers and friends feel panic, this caterpillar is called "canopy caterpillar", the following shares some of the knowledge of this caterpillar harm and prevention.
<h1 class= "pgc-h-arrow-right" > morphological characteristics of the canopy caterpillar</h1>
Canopy caterpillars graze on tree leaves
Canopy caterpillar is a completely metamorphosed insect of the lepidoptera leaf moth family, also known as the canopy leaf moth and the yellow-brown canopy caterpillar. Adult canopy caterpillars are small, about 2 cm, females are yellowish brown, males are yellowish white; egg gray and white cylindrical, 200-300 grains are gathered together and surround the branches; the larvae are initially black, gradually becoming yellow-white-black stripes, 5-6 cm long, covered with yellow-white long hairs; pupae are yellow-brown to black-brown, about 2 cm long.
<h1 class= "pgc-h-arrow-right" > the hazard characteristics of canopy caterpillars</h1>
The young leaves of maple are eaten away
Canopy caterpillars are mainly larvae that harm the young leaves of broad-leaved trees in April and May, and in severe cases, the young leaves of the entire tree can be eaten away, and then the weeping silk migrates down the tree and then endangers the next tree. The larvae are characterized by clusters, often densely clustered under the trunks of trees, lying down during the day and at night, gathering during the day, and causing harm at night, especially at the edge of the forest.
<h1 class= "pgc-h-arrow-right" > the occurrence of canopy caterpillars</h1>
Endangered maple trees
Canopy caterpillars occur only once a year, in southern Anhui, generally in early April larvae hatch, began to harm the trees, late April to early May hazard peak period, late May cocooning, early June feathering and spawning, to hatch again the following year to produce harm.
<h1 class= "pgc-h-arrow-right" > control method for canopy caterpillars</h1>
Drug control
The common and simplest control method is to spray high-efficiency and low-toxicity permethrin insecticides, in the morning and evening on sunny days, using the characteristics of canopy caterpillar larvae like to gather, according to the prescribed dose to kill;
Secondly, black light lamps can be placed to use the phototropism of the caterpillar to kill;
In addition, it is necessary to strengthen the management of care, use the removal of egg mass during care, and concentrate on burning, which can also effectively prevent the occurrence of the next year.
As for the use of natural enemies for biological control, it is difficult for ordinary farmers to do so, and they can pay attention to the protection of birds in their daily lives.
Another way is to buy smoker, which can also play a good role in fumigation by taking advantage of the low-pressure climate characteristics of morning and evening to release smoke under the forest.
<h1 class="pgc-h-arrow-right" > sky caterpillars are in generations every year and do not recur to harm trees again, so there is no need to panic</h1>
Gathering sky caterpillars
Because the canopy caterpillar only occurs once a year, and the damage time is short, it occurs from April to May, and then cocoons in June, and will not hatch again to eat the leaves, so it is difficult to form a sustained hazard and generally does not kill the tree. Although the leaves of the tree are eaten away when the harm is serious, because the harm time is earlier, the tree will basically grow new leaves again, but the scene is very frightening when the harm is serious, especially when gathered under the tree, it is very uncomfortable.
Of course, when the canopy caterpillar is endangered, when a leaf is eaten, it will also migrate and hang in mid-air, and when it is serious, the front and back of the house are crawling with hairy larvae, affecting the lives of residents and bringing inconvenience to people's lives, or it is better to prevent and control it, which can effectively avoid recurrence in the coming year.
<h1 class="pgc-h-arrow-right" > summary</h1>
In short, although the current canopy caterpillar is frequently appearing in various parts of the countryside, especially near the forest edge behind the house in front of the house, many young leaves of broad-leaved trees have been eaten away, but because the canopy caterpillars are generationd every year, the harm time is short, so there is no need to panic, will not kill the trees, conditionally can be sprayed with permethrin insecticides to kill, control the harm, but also effectively reduce the occurrence of the following year.