Cotton brown spot
The main symptoms are damage to leaves. Cotyledons infected with primary needle size purplish red spots, and then expanded into brown, purple edges, slightly raised round to irregular disease spots, multiple disease spots fused together in the shape of large disease spots, small black spots scattered in the middle, that is, the conidium of the pathogen. The center of the lesion is easy to break, fall off and perforate, and the leaves fall off seriously. The disease spot of the true leaf is round, yellowish brown, and the edge is purplish red.
Pathogen Phyl10stictagossypinaEll.etMart. It is called cotton leaf spot mold and P.malkoffiiBubak. It is called Markov leaf spot mold, and it all belongs to the subphylum of semiknowns. The conidia of the two bacteria were buried in the leaf tissue. The former is spherical yellowish brown, 93.8 μ m high, 85.7 μ m in diameter, 18 μ m in diameter and dark brown. The conidia are oval to oval, with 1 oil drop at each end, 4.8-7.9 μ m long and 2.4-3.8 μ m wide. The conidia of Markov leaf point mold are oval to short cylindrical, with a size of 7.04-9.28 × 3.63-4.5 (μ m), and also have 2 oil spots.
The transmission route and disease condition of the two pathogens overwintered on the residual body with mycelium and conidia. In the following year, a large number of conidia were released from the conidia, which were transmitted by wind and rain and germinated under the condition of high humidity. When the first true leaf of cotton grows, the seedlings grow weakly and are prone to disease in case of low temperature and rainfall.
For control methods, see Cotton Wheel spot.
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Application of Tea Cake in Aquaculture
Tea cakes contain hemolytic tea saponins, 11%-16% crude protein, 5%-7% fat, 40% digestible sugar, 11% nitrogen, 0.37% phosphoric acid, 1.23% potassium, and a variety of essential amino acids for animals. It is widely used in aquaculture. ① medicine pond is rich in water. Tea cake is the preferred pond cleaning agent for fish, shrimp and crab mixed culture ponds. The method of medicine pond is as follows: in the pond with water depth 30~50cm, the tea cake is crushed 25kg / hm3; the pond with 1m water depth can be increased to 50k.
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Storage technology of sweet potato
A, sweet potato storage problems easy to occur sweet potato in storage during the easy occurrence of cold damage, germination and decay. Sweet potato is thermophilic and afraid of cold and humidity. The storage temperature is 10~14℃ and the relative humidity is about 80%. Below 10℃, cold damage easily occurs, and sunken patches appear on the epidermis, resulting in decay. Sweet potato has no physiological dormancy period. If the temperature is high (15~20℃), the relative humidity is above 85%, and the ventilation is not good, it will germinate at any time. Germination consumes internal nutrients and makes it inedible. Sweet potato skin thin,
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