The Study On Generation And Integrated Control Of Tobacco Mosaic Virus Diseases

This study researched and forecasted on the circs of Tobacco Mosaic VirusDiseases and aphid which happened in LiuYang, found the regularity and relativityboth of them;We studied the contrast test to different pesticide in order to controlTobacco Mosaic Virus Diseases. Basis on the fact of LiuYang, created the integratedcontrol rules of Tobacco Mosaic Virus Diseases in LiuYang, and demonstrated andunify control for great area to it. The results as follows:1. Tobacco Mosaic Virus Diseases is one of the most importance diseases inLiuYang, it has effected on the income of tobacco grower and the local economy.Tobacco Mosaic Virus Diseases has been take place 2800hm², the yield lose 1509.7thousand kg, the loss was 14842.5 thousand RMB to tobacco grower.2. In the investigating for four years, there did not found Tobacco Mosaic VirusDiseases in seeding time. The transplant time is more early, and the Tobacco MosaicVirus Diseases come on more early in field; the disease index of Tobacco MosaicVirus Diseases was being increase fast from end of March, and reached peak on endof May; the disease index of Tobacco Mosaic Virus Diseases was steady since cut budin end of May.3. The aphid and Tobacco Mosaic Virus Diseases occur direct proportion, thetransplant time is more early, and the aphid moved into tobacco field more early, theTobacco Mosaic Virus Diseases come on more early in field, the moving peak ofaphid is more early, and the amount of moving into is greater, the incidence of adisease of Tobacco Mosaic Virus Diseases is more high comparatively in field, thedisease index is bigger; the amount of aphids is greater in field, and the amount isbigger in the year, the incidence of a disease of Tobacco Mosaic Virus Diseases ismore high comparatively in field, the disease index is bigger.The correlation formula between aphid and Tobacco Mosaic Virus Diseases forminvestigating and analyzing as follow: y₁=31.41+0.0068x (n=4r=0.42^*) y₂=11.03+0.010x (n=4r=0.33^*) y₃=18.3+0.067x (n=4r=0.67^*) y₄=6.7+0.049x (n=4r=0.59^*)The forecast formula of aphid moving direction as follow: y=-85496.82+9.056x₁+1443.6x₂+1274.816x₃-1001.676x₄+44.888x₅+422.274x₆+6060.463x₇ (R=0.6736)The forecast formula of Tobacco Mosaic Virus Diseases occuring direction asfollow: y₁=555.76-0.085x₁+0.00155x₂+1.74816x₃-17.83646x₄-0.02653x₅-0.05484x₆-1.6736x₇ (R=0.596) y₂=310.0732-0.04545x₁+0.0006568x₂+1.3096x₃-11.61x₄-0.01023x₅+0.11152x₆-0.716x₇ (R=0.688)4. The control effect indicated that Duxiao 600 multiple liquid has better effectto Tobacco Mosaic Virus Diseases, the control effect was 75.6%, but, after tobaccoinfected the disease, the incidence of a disease, disease index did not decrease evenused different pesticide. As a result, we ought to give priority to defend andcomplement control with pesticide to Tobacco Mosaic Virus Diseases, especiallycontrol aphid on time, and enhance sanitation work in field.5. It has some effect that implement integrate control and unification control. Atthe same time, the Tobacco Mosaic Virus Diseases harmed the tobacco decreased in2006 pass integrate control and unification control for two years in demonstrationsection.