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Influence of time of infection by tobacco mosaic virus and tobacco etch virus on agronomic chemical and physical properties of tobacco nicotiana tabacum cultivar md 609



Influence of time of infection by tobacco mosaic virus and tobacco etch virus on agronomic chemical and physical properties of tobacco nicotiana tabacum cultivar md 609



Tobacco Science 25: 25-29



Field studies were conducted in 1977 and 1978 to examine the influence of mechanical inoculations of Maryland tobacco, cultivar Md 609, with tobacco mosaic virus (TMV), tobacco etch virus (TEV) and the combination TMV and TEV 4 and 6 wk after tansplanting on agronomic, chemical and physical properties of the cured tobacco. The experiments employed a split-plot design with time of inoculation as the main-plot treatments and virus plus control the subplot treatments. Statistically significant differences were observed among the treatments for yields, value, quality index, total alkaloids and burn from a combined analysis of variance of data from the 2 studies. The inoculations during the 4th wk after transplanting caused much greater yield differences than inoculations 6 wk after transplanting. Among the virus treatments, TEV appeared more damaging than TMV and the combination TMV .ANG. TEV produced the greatest damage. Reductions in cured tobacco yields, value and quality index values, compared to controls, from the virus inoculations 4 wk after tansplanting were: 25.8, 28.2, 3.4 and 8.5%, respectively, by TMV; 37.0, 39.8, 4.4 and 14.3%, respectively, by TEV; and 49.5, 52.3, 5.7 and 18.0%, respectively, by TMV .ANG. TEV. Alkaloid levels were generally higher in the virus-treated plants and were highest in the plants inoculated 4 wk after tansplanting. The tobacco inoculated with TEV 6 wk after transplanting had the longest burn time. No statistical differences were found in the total N contents or filling capacity values following the virus treatments.

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