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01 "Hairy belly" stem
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This is indeed less common, and from a characterization point of view, it is not like a conventional disease infection, and mycosis should be considered, and it is an initial symptom.
By consulting the relevant literature, the pathogenic rate is probably Slime mold, Velvet bulbous order, Velvetaceae, Bridle fungus, bridle fungus of the genus Chorus, and later compound cyst formation may be the size of an egg.
The source of initial infection of slime mold comes from the soil with slimy spores or from the air that settles down in the air, which is conducive to high humidity.
Slime mold long-term attachment, can cause citrus stem malnutrition, and even lead to the base of the stem rot, can be sprayed methyl thiophex, allicin, azoxystrobin, polyantimycin, humus and so on for prevention and control, pay attention to the treatment of soil, moisture control.
02What is this moth?
From this shape, it should be some kind of ancient poison moth (advanced larvae), like most lepidoptera pests, mainly larvae to eat leaves, young shoots, resulting in lack of carvings or holes, and can eat the whole leaf when it occurs.
After seeing it, don't scratch it with your hands, it is easy to be allergic to redness and swelling; the agent can be compounded with methylphenidate and chlorhexabenzamide, and the lower the age of the insect, the better the effect.
03 Oil spot disease
Oil spot disease belongs to the category of physiological diseases, since the middle stage of citrus puffed fruit has occurred from time to time, drug pests, diseases, insect pests, environmental stresses, etc. caused by peel damage, essential oil spillage can become a cause, the symptoms of the lesion is the subcutaneous necrosis, oil cells from protrusion to atrophy into leathery.
Once the disease occurs, there is almost no way to repair it, only to remove or reduce it to a worthless secondary effect, so reducing or trying to avoid its occurrence is the right way.
Prevention should grasp the two core points, that is, to reduce the wound on the fruit surface and improve the toughness of the peel. Specifically, such as diligent prevention of diseases and insects, scientific use of drugs, active response to environmental stress, and spraying of Gesme during the expansion period to increase the level of calcium and borin.
Gazmet, calcium and magnesium with supplementation, the effect is better, Gazmei is suitable for spraying at the fruit stage, can reduce the cracking of fruit, improve the quality of fruit, it is recommended to spray 800-1000 times with water, generally sprayed 2-3 times.
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04 The umbilicus is cracked
This year this is particularly common, starting with abnormal yellowing and micro-cracks in the umbilicus, and then slowly cracking and necrosis, and some of them falling off early.
The reason is that the umbilicus is yellow due to the lack of calcium, boron, etc., and then it is torn apart, and when it is severe, the entire umbilicus is black and necrotic.
For milder symptoms (Figure 1), gaisme (containing calcium foliar fertilizer) + kendole brassinolide + pyrazole ester can be tried to improve, but it is difficult to fully recover, and only crack suppression can continue to worsen.
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This article is written and sorted by the agricultural assistant team, please be sure to indicate the source of the agricultural assistant, do not modify the content of the article, the modification must be investigated!