A few days ago, I deliberately went to my own mulberry field for a circle, and found that the mulberry trees were not growing well, according to the time period of previous years as a criterion, the mulberry trees at this time appeared to be very short, which broke the hearts of silkworm farmers, which meant that the mulberry leaf yield was greatly reduced. What makes me more helpless is that the leaf quality is not good, the leaves are narrow, according to my observation, most of the leaf surfaces have many small holes, the color of the leaves is not all yellow spots, you can look at the picture I shared below, whether your mulberry tree has also encountered the same situation. Obviously, this is a typical mulberry insect pest, the roots and branches of the mulberry tree are not obvious abnormalities, the problem only appears on the leaves, it is now autumn, the temperature difference between day and night is large, the high temperature during the day is still the strong period of insect activity, and the insect infestation is easy to break out.
I observed the nearby mulberry field, and it is really not only my family that has this situation, but now the problem is very common, and the area of damage is large, and the mulberry tree insect infestation has entered a high incidence period. In this case, it is unfavorable for the cultivation of the first two batches of silkworms in the second half of the year, the mulberry leaves may cause deficiencies, the light will decline in production, and the heavy will derive other problems, such as bacterial diseases and fungal diseases, etc. I will analyze the problem of mulberry insect pests today.
< h1 class="pgc-h-arrow-right" > what are the symptoms of mulberry infestation? </h1>
We need to know that the source of insect pests in mulberry trees is not more than one kind of insect, including green insects, mulberry thrips and bridge-building insects, etc., but their harmful symptoms are different and small, as long as they combine the multi-faceted situation of the affected part, they can be identified. In our judgment, we can distinguish it more fully according to the pre- and post-state state of the mulberry leaves, as well as the symptoms of other parts of the tree.
Early symptoms: in the initial stage of mulberry insect infestation, the leaf surface is relatively smooth, accompanied by many small holes, the leaf surface near these small holes appears to be rougher, and the mulberry leaves at this time can also be properly supplied to the family for eating. Over time, the degree of roughness deepens, there are many small yellow dots on the leaves, the continuous harm of insects makes the leaves begin to become mutilated, and the color gradually becomes uneven, remember that it can no longer be used at this time, otherwise the silkworms will be affected and the health quality will decline.
Late symptoms: Once the insect infestation continues to the later stage, it is very serious, at this time the mulberry leaves are not complete, the hole that is eaten is enlarged and the water drops, and in the case of the original potholes, a large area of yellowing, or brown, even the leaf veins are eaten. In the later stages, insects can also invade the interior of the mulberry tree by biting the young shoots of the mulberry tree, and because of the presence of trauma, the bacteria also enter the tree, and the stems quickly dry out and die under the attack of insect pests and diseases, and the wounds and leaves rot with liquid.
Fortunately, most of the mulberry trees in my family are only in the early stages, but some of the mulberry leaves have problems, combined with the above many symptoms, we can confirm that it is an insect infestation.
<h1 class="pgc-h-arrow-right" > what causes mulberry infestation? </h1>
Mulberry leaf insect pests exist in each season, in different periods of time the external factors are different, the number and range of occurrences are different, once the conditions for their activity are met, it reaches the peak period. The most fundamental cause of mulberry insect infestation is that insects overwinter, which will not freeze to death in cold times, such as common bridge-building insects, mulberry whitefly, etc. The number increases in the second year after wintering, and the occurrence period will be advanced, and it will begin to flood under suitable conditions.
In general, silkworm farmers do not leave mulberry strips in the ground after cutting the strips, which provides a place for insects to overwinter, and external factors have played a role in promoting the occurrence of insect pests, including temperature and humidity and mulberry permeability.
Influence of temperature and humidity: The insects that overwinter basically migrate in March and April, some directly in contact with mulberry leaves, some lay eggs in a comfortable place, and begin to nibble on mulberry leaves in summer. For the insects that harm mulberry trees, the activity is most enthusiastic at above 20 ° C, even if autumn has arrived, the day is still very hot, coupled with the rain, the humidity is more than 80%, the insects are the most rampant, take the bridge-building insects, August and September are the period of large outbreaks.
Permeability effect: mulberry land requires good permeability, if the mulberry leaves are too dense, it undoubtedly provides a place for insects and bacteria, creating a suitable space for breeding and growth of insects after wintering, even if the temperature is not so high, this space can also be insulated, laying a disaster for insect pests. Another point is that the mulberry leaves are too close to lead to an increase in the degree of harm, and the loss of pest infestation will be very large, and the leaves in the early autumn are soft and small, and they cannot withstand the toss.
<h1 class= "pgc-h-arrow-right" > these 4 control measures are critical to avoid reducing mulberry leaf production</h1>
The specific control measures of mulberry tree insect pests should be carried out according to the cause of occurrence, and prevention is carried out when there is no large occurrence of insect pests, which is the best practice, can do a good job of field management and timely pruning of mulberry trees, if the insect pests are already obvious, then you can only directly spray agents to recover part of the loss.
Field management: This is mainly for the soil, leaving no opportunity to overwinter the insects, at the end of each cutting strip, the mulberry garden must be sorted out, and the debris, including weeds and garbage, is removed. Ploughing is carried out in winter, and one month after the end of sericulture in autumn, ploughing to remove insects will remove some pests at the root and greatly reduce pests.
Hunting larvae: Most of the larvae will be after cutting, to the time of mulberry leaves turning green, the night out of the activity is very frequent, at this time can be directly hunted, or first induced and then hunted, for autumn silkworm farming, in the first week of sericulture hunting is the most appropriate.
Pruning mulberry trees: this measure can improve the permeability of mulberry land, pruning methods are mainly combing buds and picking cores, when the mulberry tree grows to 30-50 cm, for some small, excess branches to be treated, directly cut off, but also to pick off some young shoots, leaving 1-2 young shoots on it, so that it will not produce too many branches to grow horizontally, not only affect the permeability to help insect pests, but also lead to mulberry trees growing not high.
Medicated treatment: This is a practice for insect infestations that have occurred, depending on the severity. Of course, spraying drugs can also play a certain degree of preventive effect, after all, the insects have weak vitality in the early stage, they will remove a batch first, and they can also be sprayed uniformly when adults are in full bloom to reduce some insect pests, at least 3 sprays. The drugs that can be selected are dimethoate, lego emulsion, dichlorvos, and imine sulfate emulsion.
Summary: My family's mulberry leaves suffer from insect infestation, as to why they are short? This is a common situation in most mulberry trees this year, as long as they grow evenly, it is not a problem with the tree itself. Mulberry tree insect infestation is not impossible to prevent, field management is the foundation, in the mulberry tree growth period must do a good job of pruning work, but also can be artificially hunted insecticides, combined with drug spraying, then, mulberry leaves can still be saved, do well, mulberry leaves are wide and thick. These points I share are just personal experience talk, there are deficiencies, welcome to leave a message below to add, I hope to help you.