First, the symptoms of ulcer disease mainly occurs in the trunk, forming a nearly circular, about 1 cm in diameter ulcers. Twigs often die after being victimized. There are two types of lesion formation. (a) Blister type. About 1 cm round vesicles were formed on the surface of the cortex. The vesicles were filled with sap, and brown sap-pouring sap flowed out. After dehydration and dehydration, the blister forms a slightly sunken spot. Blister lesions only appear on the trunks of saplings and branches of the light skin species. (b) of the dead spot type. First, a few millimeters of water-soaked round spots appeared on the bark, slightly bulging, and the hand pressure was soft. After drying, it became a round spot of dark spots, dark brown. Second, the incidence of the disease caused by the disease caused by the dip, the bacteria mainly in mycelium in the sick tissue overwintering, mainly by wind, rain spread. The pathogenic bacteria are weak parasites. All the conditions that cause debilitating trees are the cause of the disease. For example, seedling transplantation, spring drought, cold spring, wind and sand, extensive management, and saline-alkali land are all easy to cause diseases. Different poplar varieties have significant differences in resistance to ulcer disease. Third, the prevention and control methods (a) to establish a nursery in the no-disease area, training healthy seedlings, strengthen quarantine, the quality of good seedlings. Disable serious planting of seedlings after afforestation or planting after cutting. (ii) For tree species that are resistant to disease, tree species suitable for local site conditions and climatic conditions shall be selected to exert their own disease resistance. (3) Minimize water loss in seedlings during afforestation, with the seedlings planted with planting, less rooting, and avoiding long-distance transportation.
Frozen fish portion is the part of all
kinds of fishes, like fillet, roe, milt and so on. This category contains the
following products: Frozen Mackerel Fillet Piece, Mackerel Butterfly Fillet
Piece, Frozen Spanish Mackerel Fillet, Frozen Mahi Mahi Fillet, Frozen Mullet
Gutted, Frozen Mullet Roe, Frozen Mullet Milt, Frozen Mullet Gizzard, Frozen
Cooked Frigate Tuna Meat and Frozen Cooked Tuna Meat.
R & D and innovation is the focus of
modern enterprise, so our company have established cooperative relationship
with some famous universities like Zhejiang University of Technology and
Shanghai Ocean University and so on.
We will always strive to create more
delicious, natural and safer marine health food.
Frozen Fishes Portion
Frozen Fishes Portion,Frozen Mackerel Fillet Piece,Frozen Spanish Mackerel Fillet,Frozen Cooked Tuna Meat
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