Fungicides vary with respect to how frequently they can be applied, but most are allowed once every 7 days.īe sure to read and follow label instructions when using any fungicide or other pesticide. Even under severe late blight conditions the use of. If you’re spraying plants to protect them from leaf spots, they should be sprayed regularly to maintain protection. Contact fungicides will be the backbone of any late blight spray program because they are cost effective. These are the most effective fungicide treatments for tomato plants. When bacterial leaf spot is known to be the problem, a combination of copper and mancozeb is suggested. The three most common types of tomato blight in tomatoes early blight, late blight, and Septoria leaf spot can be treated and controlled similarly with fungicides and by practicing good preventative care. These help protect plants from most fungal leaf spots.Ĭopper-containing fungicides (active ingredients like copper octanoate, basic copper sulfate, or copper diammonium diacetate complex) have the benefit of protecting plants from leaf spots caused by bacteria as well as fungi. Comparing the fungicide mixtures tested, the higher concentration of Infinito. ![]() ![]() The fungicide mancozeb is another option but cannot be applied within 5 days of harvest. blight on tomato, was evaluated on four localities in 20. Home garden fungicides containing chlorothalonil are common. When leaf spot diseases are present, fungicides can be applied to minimize spread, or to protect not-yet-infected leaves. Other ways to minimize leaf spot problems include not working in the garden when leaves are wet from rain, dew, or irrigation rotating where in the garden you plant tomatoes removing old plants at the end of the season and doing a good job of managing weeds in the garden. Using a soaker hose or drip irrigation is preferable with respect to disease management, since it avoids wetting leaves altogether. If you use a sprinkler or spray water around plants with a hose, do this in the early morning so that the leaves dry quickly rather than staying wet for longer, as they typically will when watered late in the day. We can’t control when it rains, but we can avoid watering plants from overhead in the late afternoon or evening. With the temperature 26-28 ℃, this disease is severe under high temperature and humidity.ĬHICO has accumulated rich experience and could offer the corresponding high-class solutions, e.g.: the series of CALIBUR PRO®(Thiodiazole Copper 18% + Kasugamycin 2% SC), CYFA ®(Cymoxanil 30% + Famoxadone 22.5% WDG).Besides diseases that kill tomato plants outright, as discussed in last week’s article, there are leaf spot diseases that can reduce plants’ productivity and sometimes infect fruit.Īlmost all leaf spot diseases – on tomatoes and other plants – are favored by water on the leaves. Five to ten dark, round dots on a leaf indicate early blight tomato. Early blight tomatoes can also damage the foliage of potatoes. ![]() It almost yearly causes substantial leaf, stem, and fruit damage to West Virginia’s tomato production. It invades and spreads directly from the stomata, wound or epidermis through airflow, irrigation water and farming operations. The fungus Alternaria solani causes early blight tomatoes, which is one of the most prevalent tomato illnesses. The pathogen mainly overwinters on the diseased residue and seeds with mycelia and conidia. The main and most common type is solanaceous plants (such as early blight of tomatoes, peppers, potatoes and eggplants), belonging to the genus Alternaria, a fungus of the subgenus Hemiptera. The main occurance crops are: Leguminous crops such as beans and lentils, carrots, cloves, mulberry, cassava, etc. Bacterial blight is caused by the infection of xanthomonas,which mainly overwinter in the seeds and can also overwinter in the soil with the disease residues.Īfter the plant gets sick, it will produce bacterial pus, which is transmitted by wind, rain and insects, and invades from the water hole, stomata and wound of the plant leaves.
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