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Method for preventing and controlling mosaic viruses in tobacco float seedlings

A technology for floating seedling raising and mosaic disease, which is applied in the field of prevention and treatment of tobacco floating seedling mosaic disease, can solve the problems of tobacco seedling damage, incomplete disinfection of people and leaf cutting tools, and achieve the effect of ensuring safety

Inactive Publication Date: 2012-07-11
YUNNAN TOBACCO CO LTD KUNMING BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of floating seedling cultivation, in order to cultivate robust tobacco seedlings, it is necessary to carry out mechanical cutting of seedlings 3 to 5 times or carry out 1 time of leaf pinching and exposing of stems before transplanting. The general damage of seedlings, the transmission of TMV is very easy to occur during this period, coupled with the imperfect disinfection of people and leaf cutting tools during the leaf cutting process, these provide opportunities for TMV to be transmitted by contact

Method used

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  • Method for preventing and controlling mosaic viruses in tobacco float seedlings
  • Method for preventing and controlling mosaic viruses in tobacco float seedlings
  • Method for preventing and controlling mosaic viruses in tobacco float seedlings

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0022] Spray the organic antiviral agent within 24 to 36 hours of each follow-up seedling cutting or leaf pinching described in step B ②.

[0023] The organic antiviral agent is an organic induction antiviral agent.

[0024] The organic antiviral agent described in step A is Polypeptide Bao or AHO.

[0025] The organic antiviral agent described in B step ① and ② is AHO or chitosan.

[0026] The organic antiviral agent described in step ③ is AHO, chitosan, saikosaponin A or ginkgolide B.

[0027] The molecular weight of the chitosan is 500-1500.

[0028] The spraying of the organic antiviral agent described in step B 1., 2. and 3. should avoid spraying in the time period with strong light intensity when it is sunny, and it can be sprayed all day in cloudy or rainy days.

[0029] The time period with strong light intensity is from 11:00 am to 4:00 pm.

[0030] The organic antiviral agent is water, emulsion, wettable powder, water dispersible granule.

Embodiment 1

[0032] Add (by weight) 1.5% Polypeptide Bao to the seedling raising matrix before loading into the tray, mix well, then put the substrate into a tray, and raise seedlings according to the technical specifications; Spray 1 time (volume ratio) of 5% AHO within 24~48 hours before the leaves, and the spraying amount is 60Kg per 100 square meters of seedling trays; spray once within 4~36 hours for each subsequent seedling cutting or leaf pinching (volume ratio) 5% AHO, the spraying rate is 60Kg per 100 square meters of seedling trays; after the last leaf cutting, spray (volume ratio) 5% chitin with a molecular weight of 500~1500 once every 7 days Polysaccharide, the spray rate is 60Kg per 100 square meters of seedling trays; until the end of the seedling period.

Embodiment 2

[0034] Add (by weight) 3.5% AHO to the seedling-raising substrate before loading into the tray, mix well, then put the substrate into a tray, and raise seedlings according to the technical specifications; Spray once (volume ratio) 0.5% AHO within the first 24 to 48 hours, and the spraying amount is 120Kg per 100 square meters of seedling trays; spray once within 24 to 36 hours for each subsequent seedling cutting or leaf pinching ( (volume ratio) 0.5% AHO, the spraying rate is 120Kg per 100 square meters of seedling trays; after the last leaf cutting, spray once every 6 days (volume ratio) 0.5% chitin polymer with a molecular weight of 500~1500 Sugar, the amount of spraying is 120Kg per 100 square meters of seedling trays until the seedling stage is over.

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Abstract

The invention discloses a method for preventing and controlling mosaic viruses in tobacco float seedlings, comprising a matrix treatment process and a seedling management process. The method comprises the steps of adding (by weight) 1.5-3.5% organic antiviral agent before loading a seedling culturing matrix in a tray, and mixing sufficiently; spraying (by volume) 0.5-5% organic antiviral agent once before 24-48 hours of first leaf cutting for tobacco seedlings; spraying (by volume) 0.5-5% organic antiviral agent once within 4-48 hours of every subsequent seedling cutting or leaf pinching; after the last leaf cutting, spraying the organic antiviral agent once every 6-7 days utill the end of the seedling culturing period; and the spraying amount of the organic antiviral agent is 60-120kg for every hundred square meters of the seedling culturing tray. The method of the invention combines the spreading characteristic of tobacco mosaic virus, performs antiviral treatment from the period of seedling culturing matrix treatment to the different stages of seedling management, utilizes the organic antiviral agent to induce the disease resistance of tobacco seedling system, blocks the contact transmission of viruses caused by seedling cutting or farming operations during the seedling management, so that even the tobacco seedlings carry viruses, the symptoms are not shown, and the seedlings can still grow normally, therefore, tobacco float seedlings have an effect of preventing TMV (Tobacco Mosaic Virus).

Description

technical field [0001] The invention belongs to the technical field of tobacco floating seedling cultivation, and in particular relates to a method for preventing and treating mosaic disease of tobacco floating seedling cultivation. Background technique [0002] Tobacco mosaic virus (TMV), the pathogen of tobacco mosaic disease, seriously endangers tobacco production, reduces the yield of tobacco leaves, and seriously affects the intrinsic quality of tobacco leaves. TMV can overwinter on a variety of plants and weeds, which are the main sources of toxins for initial infection. Toxic residues in the soil or mixed in seeds, and poisonous fertilizers that are not fully decomposed are also the main sources of TMV. source of infection. TMV is mainly transmitted through mechanical friction with poisonous juice, and the micro-wounds caused by slight friction between infected diseased leaves and healthy tobacco leaves are enough for TMV to invade healthy tobacco leaves. In the pro...

Claims

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Application Information

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IPC IPC(8): A01G31/00A01G13/00
Inventor 徐兴阳董家红端永明张仲凯杨永平陈永对陈穗云郝小江张廷金高福宏
Owner YUNNAN TOBACCO CO LTD KUNMING BRANCH