More than 10 caterpillars crawl on a single leaf in multiple neighborhoods in the city

This summer the weather is sweltering, and the occasional rainfall fills the air with a damp atmosphere. The high temperature and high humidity weather provides a good opportunity for insect breeding, and in the past few days, many readers have reported that some trees in some communities in our city have been invaded by American white moths. What are the garden diseases and pests in our city? Why is the pest infestation high this year? ...... The reporter interviewed this.

Trees in multiple neighborhoods are "attacked" by caterpillars

Mr. Gao's family lives in Shanluan Street, Zhongshan District, on August 22, he took his children out for a walk, found that several trees in the community seemed to be hanging cotton wool, and a closer look found that it was the trees that had suffered from diseases and insect pests. "The leaves of several trees have been almost eaten into translucent shapes, and there are many flocculent nets." Mr. Gao said the leaves of the trees were all nibbled by caterpillars. This caterpillar is covered with long white hairs, ranging from 1-3 cm long.

"There are too many caterpillars, densely packed, and they look particularly frightening." Mr. Gao said that there are more than 10 caterpillars on a single leaf. The nearby ground was also crawling with bugs, and the excrement of bugs was spilled on the ground.

"The key is that the insect infestation will spread, the trees on this side will eat, and they will eat other trees, and the trees in the next community also have this kind of insect, and there is a mountain next to our community, if it really spreads, the consequences will be serious!" Mr. Gao was worried about this.

"I feel that this year's pests and diseases are particularly serious." Mr. Gao said he has lived here for more than 20 years, and there have been caterpillars on the trees before, but they are all sporadic, not as many as this year. In addition, Mr. Gao visited and found that only the trees in the community had caused insect infestation, "the trees on the main road nearby did not have this situation." "

The reporter learned in the interview that insect pests have been found in many communities in the city. Ms. Zhang, who lives at No. 154 Zhongnan Road in Zhongshan District, also told reporters that some leaves in their community suffered from insect infestation. On the morning of August 24, the reporter saw at the scene that a tree located at the foot of the mountain, the leaves were basically gnawed, there were many flocculent nets on it, and a layer of black granular feces was laid on the ground, and there were still black particles falling from time to time.

The reporter approached and carefully observed, suddenly there was a creepy feeling, a piece of leaf that did not gnaw on the top, actually climbed more than 10 caterpillars, some small branches, also crawled with caterpillars, the number of caterpillars on the whole tree is countless ...

Some citizens were stung by caterpillars

"In addition to pine trees, all kinds of green trees in our community have basically been 'killed'." Ms. Wang, who lives in the mountain residence notes in Ganjingzi District, said that in recent times, the leaves of various green trees in their community have basically been gnawed by caterpillars.

Ms. Wang said that at first, this caterpillar only appeared on one kind of tree, and then slowly spread to other green trees, this insect breeding speed is too fast, a few days of effort, the various green trees in the community have basically "fallen".

"There are too many bugs, falling straight under the tree, the ground also climbs a lot of caterpillars, one foot can step on several, some owners park under the tree, the result is a layer of black granular feces, sticky, can not be washed off." Ms. Wang said that in recent times, residents in the community have to trot all the way from under the trees, and afterwards they have to check whether they have fallen bugs, "I heard that some owners have been stung by bugs." "

Ms. Wang inquired through the Internet and found that the caterpillar should be the larvae of the American white moth. A female moth lays an average of 800 eggs per generation, up to 2,000 grains, and 1 female moth lays eggs in the spring, breeding 200 million in a year, which can encroach on 50,000 trees! The American white moth is a heterogeneous food, which is seriously harmful, harming more than 300 crops, and can eat all the leaves in 2-3 days.

Ms. Wang paid attention to it, and found that caterpillars also began to appear on the trees in other communities, but the number was not so much, "We are next to Longshan, in case this insect spreads to the mountain, according to the breeding rate of this insect, the consequences will be serious." "

Ms. Wang said that the trees in the community suffered insect infestation, and they also reflected to the community property, "I saw someone come to give medicine to the tree, I don't know if the medicine is wrong, or the medicine is washed away by the rain, in short, the effect is not very obvious." "

In addition, Ms. Yang, who lives in Huanshan Street in Zhongshan District, also told reporters that the many trees below them were crawling with dense caterpillars, "too many, after falling down, I dare not walk under the tree." "

Why is the pest infestation high this year?

In this regard, the relevant person in charge of the Landscaping Management Department of Dalian City Administration Bureau introduced that there are many causes of garden diseases and insect pests, mainly related to climate, environmental pollution, plant diversification and some human factors. In the summer, the temperature and humidity of our city have increased significantly, which has affected the epidemic of some diseases and insect pests to a certain extent.

There are many environmental factors, such as the increasing number of cars in our city year by year, private car exhaust emissions, dust coverage, domestic sewage discharge, etc. will cause the ability of garden vegetation to resist pests and diseases to gradually decline, and the diseases and insect pests will increase.

In terms of vegetation distribution, the vegetation in our city is relatively rich, and the diversity of plants also provides a possibility for the interaction of pests and diseases between plants. In addition, the destruction of urban green space systems by human factors is also one of the reasons that can lead to the decline in the ability of green areas to resist pests and diseases. At the same time, the biological chain in urban gardens is relatively fragile, and there are few natural enemies of pests, resulting in the proliferation of pests. In addition, this year's rainfall is frequent, and rain erosion will affect the exertion of medicinal effects. "We all sprayed based on the weather forecast, but sometimes we just finished the medicine and ended up catching up with a rain, resulting in the spraying of drugs not having the desired effect." The person in charge said.

What are the common garden insect pests in our city?

Zhang Bo, senior engineer of the Garden Center of the Zhongshan District Urban Construction Service Center, introduced that there are many main pests of garden plants in our city, which are mainly divided into leaf-eating pests, dried moth pests, underground pests and other categories.

The more common pests and diseases in our city are American white moth, inchworm, aphid and so on.

The American white moth is a worldwide quarantine pest, which will harm the French plane trees, white wax and other landscaping trees in Dalian. Because the American white moth prefers a warm, humid oceanic climate, it is particularly harmful in years with heavy spring rains.

Inchworm (commonly known as hanging ghost), the common type of inchworm in our city is the national locust inchworm, this insect is not small, if not prevented in time, the leaves of the tree will soon be gnawed into a "bald head".

Aphids, also known as honey worms, greasy insects, are pests of stinging mouth organs, often clustered in leaves, young stems, flower buds, top buds and other parts, stinging sap, so that the leaves shrink, curl, deformity, serious will cause branches and leaves to wither or even the death of the whole tree.

More than 8,000 tons of pesticides have been sprayed this year

At present, the city's garden departments at all levels are making every effort to do a good job in the prevention and control of diseases and insect pests. For insect pests, the general garden department will control them according to the occurrence law and season. For example, the American white moth, the garden department will be based on its life history for early prevention, the American white moth generally occurs in our city for three generations each year, and the first generation of insect pests begins to appear in mid-may and late each year, at this time, the various garden departments in our city will carry out professional drug spraying and manual cutting of the mesh screen in advance, and carry out chemical and physical prevention and control in advance to prevent and control.

For different seasons of inchworm, the garden department will take different ways to prevent and control, such as the garden staff will clean up the dead branches and leaves in spring and autumn to destroy the living environment of the overwintering pupae; in the larval occurrence period from May to September, the use of black light booby traps, larval shock after the vibration centralized treatment and medicinal chemical control and other ways to control.

On the streets and in parks, people can often see workers spraying pesticides, and the landscaping department will choose the right time to spray pesticides according to the growth stage of the pest. In addition, it is also necessary to take into account the weather conditions, in order not to affect the lives of residents, the staff will often take medicine at night. Up to now, the city has sprayed more than 8,000 tons of pesticides.

Who should control pests in different regions?

The reporter noted that the citizens reported that most of the insect infestations occurred in the trees in the community, not the public green spaces such as main roads, so who should be responsible for the management of the trees in the community?

The "Dalian Urban Greening Management Regulations" stipulates that the urban public green space, protective green space, scenic forest land, etc., shall be maintained and managed by the subordinate institutions of the competent administrative department of urban construction; the green space in the residential area, where property management has been implemented, the property management unit shall be responsible for maintenance and management; if there is no property management unit, the unit determined by the district (city) and the county government according to the actual situation shall be responsible for maintenance and management; and the green space in the factory area and the courtyard area of each unit shall be responsible for the maintenance and management The flowers and trees in the courtyards owned by urban residents shall be maintained and managed by the owner or the entrusted person.

Zhang Bo introduced that while doing a good job in the prevention and control of garden insect pests, their center also specially dispatched a vehicle to help some abandoned communities in the jurisdiction to prevent and control insect pests.

Peninsula Morning Post, 39 degree video reporter Tong Liang text/photo