Lawn management is a relatively high demand in the process of landscaping management, whether it is the lawn weeding work, or the summer and autumn lawn disease prevention and control work, a little carelessness may affect the ornamental value of the lawn, and even cause large-scale death.
Regarding the lawn weeding work, as well as the prevention and control of diseases, I have explained in detail in several previous articles, and friends who want to know can check out my previous articles:
"Learn these tricks in 3 minutes, this summer, the cold season lawn will never die in a large area again!" 》
"Spring and summer, lawn weeds are rampant, the cost of manual weeding is too large, you may wish to take a look at these tricks! 》
"Do these things in spring, and it is no longer difficult to weed the lawn!" (Landscaping management dry goods))
Today, here, I mainly share with you the prevention and control methods of the two pests that we need to be vigilant against in lawn management after the autumn, grubs and light sword moths, hoping to help you!
Grub grubs, and light sword night moth, these two pests are in the autumn to the lawn is very serious harm to the lawn, one is the underground pest, mainly harmful to the roots of the lawn, as well as the young stem, resulting in a large area of dryness of the lawn; one is a leaf-eating pest, mainly feeding on the young leaves of the lawn grass, only eating the leaf flesh in the early stage, leaving a transparent epidermis, and in severe cases, the leaves and young stems will all be eaten, forming a large number of alopecia areata on the lawn.
So in these two pests, what are the hazard characteristics when harming the lawn? And what are the precautions for prevention and control? Below I will give you a brief summary:
<h1>First, the characteristics of the harm of grubs to the lawn and the prevention and control methods</h1>
1. Symptoms of grubs endangering the lawn
The picture shows grubs under the lawn
Grub is a general term for all scarab insect pest larvae, its distribution is widespread, in the north and south of China are harmful; the diet is more heterogeneous, in addition to the harm of early maturing grass, high fescue, ryegrass, dog tooth root and other lawn grass roots, cherry blossoms, maple trees, hawthorn and other seedlings are also harmful.
The lawn that has been harmed by it will have a large area of dry death, and there will be a feeling of fluffiness and softness when you step on it, and you can easily lift the turf with your hands.
2. Hazard characteristics of grubs
The picture shows grubs
Grub larvae have a strong tendency towards manure that is not fully decomposed;
During the day, it is generally hidden in a deep layer, and it will not go to the shallow soil layer until 8 or 9 o'clock at night for feeding hazards;
Grub larvae are generally more active when the soil temperature of 10 cm shallow soil reaches 13 to 18 degrees; when the soil temperature reaches about 23 degrees, it will begin to move deeper into the soil layer. Therefore, in general, in the spring and autumn, grub larvae are most harmful to landscaping plants such as lawns.
In addition, the adult grub, that is, our common scarab beetle, has suspended death and phototropism, which can be used to trap and kill in the adult stage.
3. How to prevent and control the harm of grubs to lawns?
The picture shows fertilizing the lawn
In daily management, do not apply organic fertilizer that is not completely decomposed to the lawn;
Do not let the lawn be in a state of drought for a long time, if the soil moisture content is high, it can also inhibit the occurrence of grubs to a certain extent;
In early March, late July to early August, these two spring and autumn nodes, before the occurrence of large-scale damage to grubs, use octyl thion, chlorpyrifos, diazine phosphorus and other granular insecticides, mix fine sand for application, sprinkle water for irrigation. The liquid is infiltrated downwards, so as to achieve the purpose of prevention.
When an insect infestation occurs, the same agent can be used and the dosage can be increased accordingly.
It should be noted here that the medication time is best chosen after 5 or 6 o'clock in the evening, and do not water the lawn for a week before the medication. In this way, it can be ensured that the liquid is better infiltrated when the drug is watered.
<h1>Second, the harmful characteristics of the light sword night moth to the lawn and the prevention and control methods</h1>
1. Symptoms of harm to lawn of the light sword night moth
Pictured is a young larvae of the Pale Sword Noctuid Moth
The pale sword nocturnal moth is a pest of the nocturnal family, which mainly feeds on the grasses of early maturing grass, rye grass, tall fescue, dog's tooth root, Hawaiian grass, knotweed, Manila and other grasses in the form of larvae, and is the main leaf-eating pest in lawn management in the north and south.
At a young age, the larvae mainly feed on the leaf flesh of the lawn grass, leaving a lot of transparent leaf epidermis; after the mature stage, they will enter the binge eating period, and will eat all the leaves, or the young stems of the lawn grass, so that the leaves form a lack of moments. At short, it can cause a large area of the lawn to turn yellow, or scattered alopecia area, and in severe cases, it can even cause the death of the entire lawn.
2. The harmful characteristics of the light sword night moth
The picture shows the old mature larvae of the pale sword night moth
The harm of the larvae of the pale sword moth to the lawn can last from May to October, of which the autumn is the most serious in August and September;
Low-necked larvae mainly feed at night; older larvae mainly feed in the morning and evening; if it is rainy weather, it will eat continuously day and night;
Adults have strong phototropism and are active at night. You can take advantage of this and carry out light booby-traps at night.
3. How to prevent and control the harm of the light sword night moth to the lawn?
The picture shows the lawn being laid
For the prevention and control of the light sword night moth, it is necessary to carry out prevention and control based on the principle of "prevention first, comprehensive prevention and control", and in the daily management of the lawn, it is necessary to strengthen observation, and if traces of harm are found, it is necessary to prevent and control it as soon as possible.
When planting large areas of lawn, plant more shrubs, or small trees and other plants around to facilitate birds such as sparrows to stay and eat nocturnal moth larvae;
In larger lawn green areas, insecticidal lamps or sweet and sour solutions can be set up to trap adult moths;
At the end of July or early August, the first autumn period of the light sword night moth, spray Avi * high chlorine, permethrin and other drugs on the lawn to prevent;
Generally speaking, if prevention is carried out in autumn, it is mainly necessary to spray three doses, one in mid-to-early August, once around September 5th, and once around late September;
During the high incidence of insect pests, lawns can be sprayed with water using avermectin, cypermethrin, or a combination of both; the spraying time is preferably before 8 a.m. or after 4 p.m., when the feeding of the larvae of the Alanx moth is at its peak;
<h1>Also, it's important to note that:</h1>
The picture shows the lawn being watered
Because the larvae of the light sword night moth are generally hidden in the rhizome part of the lawn grass and the part of the surface of the ground, it is necessary to increase the amount of water used when taking the drug, try to beat it evenly and thoroughly; in severe cases, it can also be sprayed every 5 to 7 days, and sprayed 2 to 3 times continuously;
After the end of pest control, the wound of the lawn grass eaten by the pest is easily infected by the lawn disease, at this time, the lawn can be sprayed with a preventive fungicide, such as carbendazim, manganese zinc, methyl tolbuzin, etc.; when spraying, you can combine some foliar fertilizer, or organic fertilizer, to the lawn grass to add some nutrients, so that it can quickly resume growth.
Well, about the autumn lawn grass management need to pay attention to the two pests, today I will share with you here.
I am the headline garden lang, you can pay attention to me, every day for everyone to update the garden maintenance technology knowledge, as well as about the little secrets of plants!