If the weather turns wet and cool, apply sprays every 5-7 days. Powelson recommends making up a small batch in a quart spray bottle, and applying it to all your tomato and potato plants in the early morning every two weeks when it is warm and dry. Infected stems harbor the fungus in dry weather, allowing the disease to spread when damp conditions return." "Cool, wet weather favors late blight development," said Ocamb. See the product label for concentrations as each of these products directions varies. These are rated as moderately effective on late blight. Use 1.5 tablespoons per gallon of water.įor gardeners wishing to not use synthetic fungicides, there are copper products such as Hi-Yield Copper Fungicide, Kocide, or Lilly Miller Microcop Fungicide. Hi-yield Maneb Lawn and Garden Fungicide is available in some garden supply shops. Products containing Maneb are also available for late blight control by the home gardener. As with all pesticides, always read the label for instructions on proper handling and application. Ortho's Multi-purpose Fungicide, Daconil is one such product and is widely available. Products containing chlorothalonil are available to the homeowner and are quite effective if used properly. "Once you see any symptoms of this disease, it is frequently too late to effectively control it," said Ocamb. But they do not cure a plant once it is diseased. If you want to be absolutely sure that you won't lose your tomatoes or potatoes to late blight this summer, Powelson and Ocamb recommend applying protective fungicides now, before you see any symptoms.įungicides act as a barrier to the disease, explained Powelson. Avoid wetting the leaves when irrigating - drip irrigation is better than overhead sprinkling. Irrigate your plants in the morning rather than in the afternoon or evening.Check for the disease regularly, in the early morning, when it shows up best.Stake and prune tomatoes to provide good air circulation. When planting, space tomato transplants and potato seed pieces far apart.Remove and bury, or bag and discard, all tomato and potato refuse laying around. Destroy volunteer tomatoes and potatoes in your garden, as they may harbor the disease.Plant only healthy-appearing potato seed pieces.
#Chlorothalonil fungicide tomato early blight free
Buy only healthy-appearing tomato transplants, free of dark lesions on leaves or stems.CORVALLIS - What can a home gardener do to discourage late blight on potatoes and tomatoes? Oregon State University plant pathologists Cindy Ocamb and Mary Powelson recommend the following steps:
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