![]() ![]() Multiple applications of fungicide are often necessary to sustain disease management to time of harvest due to the typically high abundance of inoculum and susceptibility of most common cultivars. Monitor potato physiological days (P-Days) with the VDIFN disease modeling tool described aboveįungicides can provide good control of early blight in vegetables when applied early on in infection. ![]() Destroy or deep-plow infested plant debris.Maintain proper spacing between plants (promote airflow).Avoid over-irrigating (reduce leaf wetness).Maintain proper plant nutrition with appropriate nitrogen fertilization.Maximize distance between susceptible fields.Rotate away from susceptible solanaceous crops (3-4 years).Plant resistant (possibly late season) varieties when possible.The following practices can also help prevent disease development: Scouting regularly allows early identification of disease before significant spread and damage. At the end of the cropping season, the pathogen will be present in the field as spores (conidia) or mycelium in the soil, continuing the disease cycle. Alternaria solani conidia present on soil-bound plant debris can also infect tubers wounded during harvest, although this is not commonly seen in the Midwest. These spores will then spread to cause secondary infections on the leaves. These lesions will develop conidiophores, which produce airborne and waterborne spores. These conidia then infect healthy plant tissue through the foliar plant parts including the leaf and stem surfaces, stomata, or wounds, causing lesions to form. Once temperature and wetness increase in the spring, conidia are primarily spread via wind or splashing water. solani spores (conidia) and fungal threads (mycelium) are able to overwinter on diseased plant debris in the soil. Disease CycleĪt the end of the growing season, A. Once the growing season is over, the pathogen can overwinter on infected soil-bound plant debris for several years. Older or senescing leaves are most susceptible to early blight infection. Favorable conditions for early blight development and spread include canopy closure, high humidity, prolonged leaf wetness, poor airflow, nitrogen deficiency. Spores can then spread locally from infected tissue in a similar manner. Spores can spread via wind, splashing rain, irrigation water, equipment, and workers. When conditions are right, overwintering spores (conidia) can travel within and between fields and infect healthy plant tissue. On tubers, lesions appear as dark, sunken, cork-like spots with raised margins, although tuber symptoms are less frequently seen in the Midwestern U.S. Early foliar symptoms often appear near the base of the plant, spreading up to higher leaves as the disease progresses. Lesions are sometimes limited by veins, giving an ‘angular’ appearance. Symptoms first appear as circular dark-brown spots on leaves and stems that can later develop concentric, target-like rings, often surrounded by yellow margins. Early blight is a common fungal disease of solanaceous crops (tomatoes, potatoes, peppers, eggplants) caused by Alternaria solani. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |