"The Yellow Dragon is coming, the gods and immortals have no way, they can only say that the work is done a little more, and the harvest is one or two years more" This is the voice of a farmer, I think it is very correct! In fact, the prevention and control of yellow dragons may only be a matter of convenience, and the most feared thing is not to pay attention to it.
Lemon yellow dragon disease seedlings
When Xiaobian arrived in Lianjiang, he encountered many young shoots in orchards, crawling with wood lice larvae, but unfortunately he turned a blind eye. Maybe it was the lychee harvest season, or maybe it was because I didn't feel the need to give up the pesticide money. But at the end of the year, the yellow dragon appeared, only to cut, and the cycle began again. The citrus market is surging and you can't let go when you can still make money now, so Xiaobian feels that this psyllid must be paid attention to!
Recently, the late summer shoots have also been released, and there are signs of outbreaks of wood lice everywhere, such as Guests in Guangxi, in the 4 orchards we visited, the incidence of wood lice is 100%, and its white excrement substances can be seen everywhere:
The new shoots are covered with citrus wood lice eggs and adults and nymphs
Some friends who need to put late summer shoots are also very positive for spraying, but for unwanted orchards, the author also hopes that the same can be prevented, just like the epidemic some time ago, really to prevent the main, to avoid fruit trees infected with yellow dragon disease, to prevent and control wood lice, by the way, more to the orchard to see, kill the summer lice. Then let's take a look at some of the properties of the psyllid and use the nature to rationally prevent and control it.
【Host】Citrus, yellow peel, nine incense, etc.
Adults and nymphs suck sap from young citrus shoots and young leaves, causing deformation and distortion when young shoots and young leaves. Nymphs excrete white substances, which can cause soot disease. Citrus psyllids are vector insects for orange dragon disease. (Bituminous coal disease can be considered whether this is the cause)
【Living habits】 8 generations a year occur in Fujian, 11 generations a year in Guangdong, and up to 14 generations when there are buds as food. Adults overwinter in the canopy leeward (in the spring to control the remaining lice in the garden, re-spray the canopy leeward). In February of the following year, when the first spring buds of citrus are about 0.5 cm, the first leaf semi-dew begins, and the overwintering adults suck up the sap on the young buds and lay eggs in the gaps between the leaves. Adults can be transferred to new shoots at any time for pest and egg laying. Spring shoots are the first peak of the year for citrus wood lice to breed, and after mid-May, the first summer shoots begin to emerge, especially young citrus, becoming the second peak of citrus lice pests. The autumn shoots are the period of the year when the insect population density is the highest and the most severely affected.
Adult citrus lice and nymphs
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The number of generations of citrus can reach up to 14 generations, and its adults mainly overwinter in clusters on the underside of the leaves, and when the temperature reaches more than 11 degrees, they begin to be active, 13-15 degrees are more active, above 18 degrees they begin to lay eggs and reproduce, and more than 22 degrees are active. Xiaobian inquired about the temperature in some parts of Guangxi, Guangdong, and Yunnan, and the temperature was exactly within this range after the opening of spring. In some areas, the temperature has reached before the beginning of spring. Wood lice are highly selective about food, mainly eating harmful to young shoots and shoots, so it can be prevented by observing the length of new shoots.
Adult citrus psyllid (image from the Internet)
The eggs of the psyllids are laid in the gaps between the new shoots and young shoots, and each female can lay 630-1230 eggs, which is a staggering number! In winter, Qingyuan is not thorough or Qingyuan medicine fails to effectively kill its adult insects, nymphs, and eggs, or pay special attention, after all, a pyllid can lay at least more than 600 eggs, this number really has to be prevented! Even if you have carefully cleared the garden, you must not let your guard down.
In terms of planting, it is best to plant the same citrus variety in a certain area, strengthen the management of citrus orchards, clear the garden in autumn and winter, and control the unified extraction of branches and shoots during the growth stage.
(Image from the Internet)
If the psyllids in the neighbor's orchard are serious, shelterbelts can be planted to increase the shade of the orchard, block the migration of psyllids, reduce the occurrence of psyllids, and reduce ulcer disease.
Natural enemies are also important if you control psyllids all year round, after all, drugs have an effective period, but predators have to eat every day. Natural enemies mainly include small bees, jumping wasps, seven-star ladybirds, grasshoppers and so on.
Little Bee (Image from the Internet)
The best time to control it is when the new shoots grow 0.5 cm. The length of indica rice is 0.5 cm, you can compare it, I believe many orchards have missed this period, but it does not matter, as long as you go to the medicine, the result will not be too bad.
The length of indica rice is about 0.5 cm (image from the Internet)
The use of the agent can be 35% imidacloprid 2500-3000 times, 30% thiamethoxine 2500-3000 times liquid. For long-lasting effects, you can use thiamethoxaline, or ethyl spironoate. If you hit a red spider, you can add avermectin to kill not only insects but also eggs. Re-spray every 7-10 days (depending on the interval between the agents) to prevent adults from laying eggs and kill young nymphs.
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