Bacterial base rot of rice
Symptoms mainly affect the root and stem bases of rice. The incidence of rice in the tillering stage often leads to water-soaked oval spots on the leaf sheaths of the base of near surface soil. It gradually expands to irregular brown spots and irregular white spots. The stripping of the leaf sheath shows that the root segments are dark brown and sometimes visible. Dark brown stripes, rotten roots, accompanied by foul odor, yellow leaves of the plant heart. In the jointing stage, the diseased leaves turn yellow from bottom to top, the edge of the leaf sheath near the water surface is brown, and the middle gray long strips are spotted. The discoloration of the root section is accompanied by foul odor. At the beginning of the ear period, the diseased plants lost water and dried up, and then they formed dry booties, white panicles or semi-white panicles. There was a short and less lateral root discoloration in the root section with bad odor. The unique symptom of bacterial root rot in rice is that the root of the diseased plant turns brown or dark brown rot. It is different from the heart rot of bacterial brown strip disease, acute wilting type of bacterial leaf blight, and dead heart seedlings. The disease often occurs at the same time as Pediococcus pneumoniae, Bacillus subtilis, and Reducing Substance Poisoning; it also occurs after Bacillus subtilis rots, Bacillus subtilis, and Pediococcus pneumoniae. The disease is mainly invaded through the wounds of the rice root and stem base. As long as the three unique symptoms of base rot are caught in production, they can be distinguished from the aforementioned diseases. The pathogen Erwinia chrysanthemi pv.zeae (Sabet) Victria, Arboleda et Munoz. Erwinia chrysanthemi, a disease-causing species of corn, belongs to the genus Eugenia. Bacteria solitary, short rod-shaped, obtuse at both ends, size 2.6-30.6-0.8 (μm), flagellar periwinkle, no spores and decidua, Gram negative. Beef extract peptone agar cultured on the agar cultured amoeba-like, colostrum after the white, yellow, dull. Anaerobic growth, salt-tolerant, can produce a variety of sugar acid, so that gelatin liquefaction, produce helium, sensitive to erythromycin, resulting in inhibition circle. Control methods (1) selection of disease resistant varieties. Such as Simei No.2, Guangluai No.4, Dwarf No. 23, Zhefu 802, 100 agricultural and forestry elections, Yanjing No. 2, Wuxiangjing, Shanyou No. 6, Shuangjing No. 4, Zhongyu 574, Nanxun 34 Can be chosen according to local conditions. (2) Cultivate strong seedlings, promote factoryized seedlings, and use wet seedlings. Appropriate application of phosphorus, potassium fertilizer to ensure strong seedlings. Small seedlings should be planted directly and shallowly to avoid wounds. (3) Promote the rotation of crops and dry land, increase organic fertilizers, and use formula fertilization techniques. Ground Chili Powder,Chili Powder,Red Chilli Powder,Red Chile Powder Ningxia Ningyang Halal Food Co., Ltd. , https://www.ningyangfood.com
Transmission routes and disease conditions Bacteria can overwinter on diseased rice straw, diseased rice piles, and weeds. The pathogenic bacteria invade from the upper leaf pores, wounds, leaf sheaths, and root wounds of the leaves, and is mainly invaded by roots or stem base wounds. After invading, systemic infections in the stomata of the roots are repeated throughout the growth period. Early rice began to show symptoms after transplanting, and peaked at the heading stage. Late rice fields can be found in the field, and the booting period is at its peak. Rotation, live seedlings, or seedlings transplanted rice have a small incidence. Partial or late application of nitrogen, rice seedlings tender and heavy onset. No dehydration at the end of labor or over-heating of the field. The terrain is low, and heavy air permeability is poor. The incidence of late rice is generally worse than early rice.