. Studies on the tobacco crop of Connecticut . b. Stem girdled under 14. Canker Disease of Tobacco. 54 Connecticut Experiment Station Bulletin 180. Calico, sometimes called the mosaic disease. Theexperiments of the Station botanist, Dr. Clinton, so farindicate that most of the calico on leaves of commercialvalue in the fields traces back to the seed bed or to infectionof the seedlings at the time of transplanting. To explainthis more clearly, it should be stated that calico is a disease. Fig. 15. Calico from tobacco on tomato and then back to tobacco. that is very easily transmitte
. Studies on the tobacco crop of Connecticut . b. Stem girdled under 14. Canker Disease of Tobacco. 54 Connecticut Experiment Station Bulletin 180. Calico, sometimes called the mosaic disease. Theexperiments of the Station botanist, Dr. Clinton, so farindicate that most of the calico on leaves of commercialvalue in the fields traces back to the seed bed or to infectionof the seedlings at the time of transplanting. To explainthis more clearly, it should be stated that calico is a disease. Fig. 15. Calico from tobacco on tomato and then back to tobacco. that is very easily transmitted by handling a healthy plantafter handling a calicoed plant, especially if any of the juicesfrom the calicoed plants are on the hands. This juice isonly effective on the immature or growing leaves. That is,one can touch with it a fully grown leaf at the base of atobacco plant and it will not calico, but the young leaves Tobacco Diseases. SS above will become calicoed though not even touched atthis time. From this it can be seen that if there are anycalicoed plants in the seed bed the handling of these whiletransplanting is likely to greatly spread the calico to other-wise healthy plants. This explains why sometimes in thefield one finds every other plant calicoed for quite a distancein the row. The man who set these either got the juice froma calicoed plant on his hands or else got a bunch of plantswhich had come in contact with calicoed plants,while theman who set the alternate sound plant
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