The harm of citrus leafminer moths seems to be more prominent this year, especially the trees after the local high-replantation, the young leaves of the branches and branches that are extracted are basically unable to see a good leaf, all of which are endangered by the invasion of citrus leafminer moths, if you stand farther away, the new branches of each citrus tree are like being mistakenly sprayed with pesticides, looking at the leaves curled, shrinking, and losing the tender green of the new branches and leaves.
Citrus leafminer moths harm leaf symptoms
Citrus mature trees have relatively few autumn shoots due to fruit hanging, and it seems that the harm of citrus leafminer moths is not so heavy for young trees.
<h1>Combined with the local citrus planting and management process, the harmful symptoms, occurrence rules and control measures of leafminer moths on citrus trees are summarized and shared, for fruit farmers to use as reference in the management of leafminer moths. </h1>
<h1>First, the basic situation of citrus leafminer moth</h1>
Citrus leafminer moth, fruit farmers are commonly known as ghost drawing symbols, mainly to harm the new leaves of citrus young shoots, after being harmed by leaf moths, the leaf surface will leave a lot of twists and turns of the chaotic picture, so it is called a ghost drawing symbol by the fruit farmers. For the harm of citrus leafminer moth, the difficulty of control is relatively large, one of the main reasons is that the control agent has a relatively short validity period, generally in 3 to 5 days, and the reproductive ability and speed of leafminer moth, like the citrus red spider, occurs algebraically, easily overlaps, and develops rapidly. It has increased a lot of medication and labor costs.
The number of generations of citrus leafminer moths occurs in 9 to 10 generations per year, and the generations overlap, with pupae and some older larvae wintering in the damaged leaves, and then beginning to harm the leaflets after feathering the following year.
Citrus leafminer moths harm leaf symptoms like symptoms of suffering from drug damage
<h1>Second, the harmful symptoms of leafminer moths</h1>
1. Citrus leafminer moth mainly harms young branches and leaves in autumn shoots, burrows under the epidermis of branches and leaves for feeding, sucks leaf liquid and leaf flesh, and punches holes in the inner layer of the epidermis of the branches and the epidermis of the leaves, and a gray-white curved worm path will be formed on the branches and leaf epidermis. There will be insect feces in the hole that has been harmed by the leafminer moth, and a curved and raised gray-white black line is formed on the surface of the leaf, because the insect path meanders on the leaf, it will cause the new leaf to curl and harden, the edge is back-rolled and deformed, and from a distance, it looks like suffering from a drug, when the young branches are dried up, the leaves are naturally curled and shrunk off.
2. Leafminer moth causes many wounds on the branches and leaves of autumn shoots, which is easy to induce ulcer disease and provides a good wintering place for pests such as pest mites, shield mites, mealybugs and leaf curls.
<h1>Third, the time and law of the occurrence of harm by leafminer moths</h1>
1. It begins to change into an adult worm in April of the following year, and the hazard is aggravated between May and September every year depending on the weather temperature. August to September is the heaviest period when leafminer moths harm citrus autumn shoots.
2, citrus leafminer moth to harm the new citrus new branches and leaves, in the citrus summer shoots and autumn new shoots will occur during the period, but the general summer occurrence is lighter, the main occurrence of harm to the autumn shoots is the most prominent and more serious, this is because the autumn weather temperature and humidity is very suitable for the growth and breeding of leafminer moths. In the local area, it is particularly prominent in mid-September, which is one of the reasons why the rain is more and the relative humidity is larger due to the previous weather.
<h1>Prevention and control methods</h1>
(1) Agricultural control
1. The control of leafminer moth is conducive to the prevention and control of diseases and insects by combining the stalks with the control of the shoots, and the control of the leaveshopper moth is conducive to the prevention and control of the disease and insects; the branches of the leafminer moth are cut off, and the base number of the insect mouth is controlled and reduced.
2, hanging insecticidal lamps for killing, conducive to adult insects have a certain degree of weak phototropism for booby traps, the current insecticidal lamps are based on solar energy as energy, the use and installation is also more convenient, can reduce the density of many leaf-leaving moths, by the way also prevent other types of diseases and insect pests.
3, with fertilizer to promote the shoots, so that the citrus branches are pumped neatly and robustly, the ability of the tree to resist diseases and insect pests is naturally stronger.
4. Pay attention to protecting the natural enemies of citrus leafminer moths when using citrus drugs, such as beneficial insects such as ji small bees and grasshoppers.
5. Prune the garden in winter, take the diseased insect branches out of the garden for treatment, do a good job in clearing the garden, and reduce the pest base of the citrus leafminer moth.
Citrus leafminer moths harm branches and leaf symptoms
(2) Chemical control
1. The medication time of citrus leafminer moth can start the first drug control when most of the young shoots are 1-3 cm, and then spray the second time after 7 to 10 days.
2. Drug prevention and control, the generally used agents are: chlorpyrifos, cypermethrin, methrin, thiamethoxam, high efficiency cypermethrin, acetyl. Fluoroyluria and other prevention and treatment drugs, on acetate. In terms of the performance of fluoroyluria in the prevention and control of leafminer moths, the effect and efficacy period are better than other types of agents according to local use. The actual medication can be combined with the local citrus cultivation situation and targeted selection.
3. The drug control of citrus leafminer moth is generally better to choose to use drugs alone to save drug and labor costs. It is also possible to add agents to control citrus leafminer moths when controlling other citrus diseases and insect pests.
Citrus leafminer moths are harmful to leaf symptoms
<h1>This article summarizes</h1>
Because the autumn shoots of young citrus trees or reconnected fruit trees are quick and inconsistent, it is also the focus of the prevention and control of leafminer moths, and the leafminer moths that penetrate the wormhole also need assortive agents to control. And the general control of leafminer moth agents are relatively short, the validity period is about 4-5 days, the newly extracted branches are not ripe at all, so in order to prevent the harm caused by leaf moths to the branches, it is necessary to use the above drugs to prevent and control more than three times according to the specific conditions of citrus fruit tree autumn shoot extraction, in order to effectively control citrus leafminer moths.
Text: Farmer Yin Yin
The images in the text are from original selfies
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