Why Onion nursery turn yellowish #onions #diseases #agriculture #pesticides #fungicide #pestcontrol
Channel: AGRI UMBRELLA
Date: 2023-10-22

Why onion nursery turn yellow?
payaz ke paneri q pelli hojati hay?
payaz ke paneri ko kase bachaya jaye,
onion nursery issues and solution.
Purple Blotch of Onion
Introduction 
fungus Alternaria porri. warm, humid onion-growing. Garlic and onions. 
Most long-day onions, sweet Spanish onions more All short-day cultivars are susceptible.
Symptoms
begin on older leaves with small, sunken, water-soaked lesions with light centers. Lesions enlarge as the disease progresses and turn purple to brown, often with yellow rings that create a distinctive bulls-eye pattern.
Leaves turn yellow/brown and wilt, Bulbs may become infected through neck wounds. Bulb rot symptoms begin as soft, water-soaked areas; eventually, bulbs turn dark reddish-purple, then brown/black.
Life Cycle:
The pathogen overwinters in crop residue on or near the soil surface. Spores are produced and new plants are infected during periods of warm 77-85°F humid weather. 
Symptoms appear 1-4 days after infection and black spores are produced by fresh lesions within 5 days. Spores are produced at night and released in the morning as humidity decreases. The spores are spread by wind and splashing rain or irrigation. Typical lesions occur when the leaf wetness duration is less than 16 hours; flecking may occur at 12 hours.
Cultural Controls & Prevention
pathogen-free seed/sets. Proper spacing of plants
Regular weeding will increase air circulation and decrease the duration of leaf wetness.  Avoid excessive nitrogen. Rotate out of onions for at least three years. Infected plant material should be buried deeply. 
Harvest in dry weather and avoid injury to the neck. 
Allow onions to cure properly before leaf removal. 
Control onion thrips if they are present, as plants weakened by thrips infestation are more susceptible to disease.

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#agriculturetechnology 
#pesticides #agriculture#pestcontrol 
#agriculture 
@agriumbrella
#agriumbrella.
#modernagricuture 
#agrimachinery 
#pesticides 
#pesticidefree 
#howtospray 
#agriumbrella
#pesticidewise
#Organic Acre
#spraying
#spray,
#knapsack  
#sprayer,
#backpack sprayer, #how to spray insecticides, #how to spray fungicides, #how to spray pesticides, #pesticide, #pesticides, #knapsack spraying, #spraying pesticides using a knapsack  sprayer, #fungicide, #fungicides, #insecticide, #insecticides, #herbicide, #herbicides, #how to...,Sprayer, #spraying downwards, #spraying insecticides, #spraying fungicides, #sprayingtechniques,