tomato plants - Knowledgebase Question

McKees Rocks, Pe
Question by tazmo16
June 27, 2010
i am from pgh pa and read that the tomato blight is around the area how can i protect my plants thank you again for your help

Answer from NGA
June 27, 2010


Local tomato plants may be suffering from either early or late blight, which are caused by different fungi. Early Blight is caused by the Alternaria fungus. It overwinters on infected plant material, even seeds, so it's hard to completely remove the spore reservoir from the garden by cleaning up all the vines and fruit. Early Blight works slowly, whereas Late Blight (caused by the Phytophthora fungus) may kill plants within a week. The fungus is always growing somewhere and releasing spores into the air, which moves on wind currents. If you are growing tomatoes in the same site every year, the soil could use a break from constant monocropping, but if you don't have room for a second plot, I suggest loading up the soil with good compost. Compost contains lots of helpful organisms which can work against disease organisms. Work a few inches into the existing soil, and then spread several inches on top of the soil as a barrier mulch. Once your tomatoes are planted, mulch with straw as well. Keep your plants healthy so they'll be in top condition to resist disease. Stake or cage them, and keep the lowest leaves from coming in direct contact with the ground. The best control is to avoid the disease. When choosing tomato varieties, look for the words "disease-resistant" or the letters V (verticillium), F (fusarium), N (nematodes), T (tobacco mosaic), and A (alternaria). Some of the most disease-resistant varieties include Celebrity, SuperTasty, and Big Beef. Burpee's roma-type, 'Viva ItaliaHybrid', is resistant to Verticillium, Fusarium, Nematodes, and Bacterial Speck. As far as I know, there are no varieties resistant to the late blight fungus (Phytophthora). If you follow the above practices every year, and choose resistant varieties, I'll bet the incidence of all disease will drop. Good Luck!

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