The dead tree of strawberry is mainly affected by anthracnose and root rot. Prompt pesticide control can reduce losses.
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1. Disease symptoms (1) Strawberry anthracnose: mainly damages the stolon, the young stolon from the base of the stem of the strawberry near the surface, the initial water-stained or red near-round small spots, and then developed into a round or oval red Brown to dark brown lesions, the lesions are recessed in the middle, which produces khaki viscous material, and later produces black spots and conidia discs and conidia of the pathogens. When wet, the lesion spreads to both ends. The middle of the lesion is brown, and the contraction becomes fine. The severely affected stolons will all turn black and rot.
(2) Strawberry root rot: mainly infesting roots, rhizomes and stem bases. At the beginning of the water-stained shape, the post-roots and roots, especially the fine roots and capillary roots, produce light brown to dark brown lesions from bottom to top. In severe cases, the dark brown fine roots become soft and rot, causing the upper part to wither. Generally, the leaves are green and wilting at high temperature, and they recover in the morning and evening. After a few days, the plants are withered. In the longitudinal section, the vascular bundles of the stem base, rhizomes or roots become dark brown, and the rear roots and stem bases rot, and the new roots are not long. In the seriously ill field, there will be a plot of the top of the bald ridge in which only the old mother plant is left without the new seedlings, and the dwarf diseased plants with sporadic or small area of ​​disease appear in the field.
2. Prevention methods (1) Young nursery. The first thing to do is to draw. The pesticide network suggests that the nursery nursery should first be used to remove the sickness, weeds, reduce the pathogens, reduce the pathogen, and reduce the disease condition; secondly, use the chemical control: 1 irrigation root: on the basis of the sputum, 77% of the DN can be used per acre 0.8 kg plus 70% methyl thiophanate wettable powder 0.65 kg, add to the sprayer to put the right amount of water on the ground, twist the nozzle to pour irrigation when pouring water in the field, 7~10 days once, use 1~ 2 times; 2 spray: 0.1% S-Elicitor aqueous solution (Fu Shizhuang) 2000 times liquid plus 10% fatty acid water 500 times liquid (or 33.5% quinolone copper suspending agent (net fruit essence) 800 times liquid) plus 60% azole ether · Daisenlian (Baitai) water-dispersible granules 1500 times liquid plus Wojiafu 800 times liquid for spraying, this method can treat strawberry bacterial diseases, once every 5~7 days, continuous use 2~3 times.
(2) Production area. When strawberry planting begins in September, first put a seedling in the hole soil. Before the soil is buried, you can use 600 times of Doin (25 g) plus fungicide methyl thiophanate 1000 times solution (15 g) and 30 kg in the sprayer. After the water is mixed, the roots are poured. (Method: After the nozzle is unscrewed, the root is irrigated, and 1 kg of syrup can be used to fill 7-8 seedlings. After filling the medicated water, the hole soil is sealed, so that the roots can directly absorb the medicinal water). The spray method after returning to the seedling is the same as the nursery spray.
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