Click [Follow] in the upper right corner to master more planting techniques and achieve a bumper harvest!
Mango with the "king of tropical fruits" has always been one of the most beloved fruits, its appearance is smooth, golden flesh, and sweet and sour taste is its characteristics, not to mention that it is rich in protein, vitamins and minerals and other nutrients are the needs of the human body, in addition to the branches and leaves of the mango tree can also be processed and utilized, the benefits to people are huge. We also know that many farmers choose to grow mangoes, so how much do you know about the management of mangoes during this period? Do you know about some of the common pests and diseases of mangoes? Let's take a look at it with me.
It is now September, and some farmers may face a situation in which all the newly grown young leaves are neatly cut and fallen, leaving only the base of the leaves. What the hell is going on? Who is the real culprit?
In fact, all of this is a ghost made by the common pest of mangoes. By visiting the orchard, we saw curly, dry leaves on the ground and neat knife-cut incisions in the trees. This is typical of the mango leaf-cutting weevil symptoms. Next, I will tell you more about this leaf-cutting weevil.
Mango cut leaf weevil, also known as mango cut leaf nail, leaf cut tiger and so on. It belongs to the order Coleoptera and the family Weevilidae. It is widely distributed in many planting and production areas at home and abroad. The hosts are widespread, and the common ones are mangoes, almonds, cashews and longan. Therefore, try not to mix with longan. The damage of this pest to mangoes is enormous, and when it becomes an adult, it will eat the epidermis and flesh of young leaves, leaving nearly round nibbling spots, leaving only a transparent epidermis, when the spots are connected together, causing the leaves to shrink and dry up. Female adults lay eggs on young leaves and bite off from the near base of the leaves, making neat incisions like knives, causing baldness and seriously affecting the normal growth of the plant.
The cut leaves are scattered on the ground
Let's take a look at its morphological characteristics: adult pests of this type are multi-type. According to the color of its ventral surface, it can be divided into yellow type (yellow), black type (black) and intermediate type (2-3 sections yellow at the end, and the remaining sections black). The natural population is dominated by the yellow type, accounting for 65.7%, and the black type and the intermediate type account for 34.3%. What are its habits? We learned that the annual generation of mango cut leaf elephantshea varies from region to region, with 9 generations occurring per year in Hainan, 7 generations per year in Guangxi, and 3-4 generations per year in Xishuangbanna, Yunnan. There is no overwintering phenomenon in winter.
When adult mango leaf-cutting weevils lay eggs and shear leaves, in the event of a hot sun, these fallen bands of eggs and shears quickly wilt, eventually resulting in mass death of eggs and larvae. Soil moisture content has a greater impact on the growth and development of pupae, and when it is less than 10% or higher than 20%, it can cause pre-pupal death. Adult feeding activities are related to temperature, when the temperature is 10-20 ° C, the amount of food taken decreases with the decrease of temperature, when the temperature is lower than 10 ° C, basically do not eat and stop activity. After feathering, the cut leaves of mango are like adult insects, with obvious upwardity, tenderness and clustering, often living on the young shoots and young leaves of mangoes, and when they are alarmed, they fall to the ground or fly away. Adult mating, spawning and leaf cutting mostly occur at 9-10 a.m., with no wind and rain weather; September is the month with the most adult occurrences, so autumn shoots are the most affected. Therefore, during this time, we must pay more attention to the prevention and control of such pests in time.
Leaves that are eaten by mango cut leaf weevils
At this point, some fruit grower friends will ask, to deal with this kind of pest, is it better for us to use agricultural control or chemical control? In fact, can try not to use chemical control as much as possible, the current promotion of green methods, the use of agricultural control methods, that is, the usual management combined with weeding, fertilization, control of winter shoots when turning over the pine garden soil, the destruction of pupae sites; mango pumping period, pay attention to the inspection of orchards, once found by mango cut leaf elephant beetle damage plants, need to collect the young leaves on the ground, and concentrate on burning, eliminate insect eggs, reduce the next generation of insect sources. We can also use the principle of mutual restraint between species to control it, for example, ants and parasitic bees are natural enemies of mango leaf-cutting weevils, and the natural population in the field is rich, and protection and utilization should be strengthened. Chickens can also be raised in orchards, and can feed on larvae and pupae. This method can also treat pests such as leaf gall mosquitoes that have entered the soil to pupate.
Cut leaf weevil adults
When the mango leaf-cutting weevil has reached the point of chemical control, we can use drugs to control it, and farmers need to focus on the young leaf age of the new shoots after 5 days to prevent the mango-cut leaf beetle to start spray protection to prevent adults from laying eggs and kill the hatching larvae. In the tender shoot stage, vibrate the branches before 10 o'clock in the morning and after 16 o'clock in the afternoon, and when it is found that there are an average of 3-5 adults per branch taking off, it is necessary to choose some insecticides with gastric toxicity and fumigation effect. In general, it is possible to spray high-efficiency cypermethrin, cypermethrin and other permethrin broad-spectrum insecticides, and it is recommended that you use heavy-tasting agents such as malathion and propyl bromophos to slow down pest resistance. For the areas or plots where mango leaf-cutting weevils occur seriously, it is necessary to spray and control them from time to time by means of pick-and-treat or point treatment.
In September, when the mango leaf-cutting weevil is harmful to autumn shoots, after seeing the life habits, hazard characteristics and control methods of the above leaf-cutting weevil, have you mastered these control tips? In fact, the prevention and control of such pests and the control of other diseases and pests of the same reason, are the need for us to manage the orchard, when found that there are fruit trees damaged by diseases and insect pests, timely analysis, inquiry to find information, find the most reasonable and effective control methods for its treatment, so as to make the healthy growth of mango trees, we can achieve a good harvest Oh!
If you find this article helpful, please remember to follow us!