What is the causal organism of downy mildew of Bajra?
Downy mildew or ‘green ear’ is a very destructive disease of pearl millet in Asia and Africa wherever pearl millet is grown as a food and fodder crop. The disease is soil borne in nature and caused by a fungus Sclerospora graminicola.
What are the symptoms of downy mildew of Bajra?
Downy mildew
- The characteristic symptoms of the disease are pale, chlorotic, broad streaks extending from base to tip of leaves.
- At the advancement of disease, the leaf streaks turn brown and the leaves become shredded longitudinally.
- The rapid growth of fungal pathogen is favoured by rainy and humid environment.
Why downy mildew of Bajra is also called as green ear disease?
One of the most important diseases of pearl millet is downy mildew, also known as green ear, caused by the fungus Sclerospora graminicola (Sacc.) J. Schröt that destroys much of the crop every year. The resting spores of the fungus in the soil constitute the primary source of inoculum.
What pathogen causes downy mildew?
Downy Mildew, caused by Pseudoperonospora cubensis, is an oomycete that is not a true fungus. It thrives in wet or very humid conditions as a water mold. Downy mildew can infect all cucurbits including cucumber, melon, pumpkin and squash.
What is the scientific name for downy mildew?
Peronospora sparsa (downy mildew)
What is the causal organisms etiology symptoms of ergot of Bajra?
Ergot of pearl millet (Pennisetum glaucum). caused by Claviceps fusiformis. is an important and widespread fungal disease, it causes direct grain yield loss by replacing grains with toxic alkaloid-containing sclerolia, making the produce unfit tor consumption.
How do you prevent downy mildew?
One way to control downy mildew is to eliminate moisture and humidity around the impacted plants. Watering from below, such as with a drip system, and improve air circulation through selective pruning. In enclosed environments, like in the house or in a greenhouse, reducing the humidity will help as well.
What is downy mildew of mustard?
Downy mildew is caused by the fungus-like organism Peronospora parasitica, and can attack broccoli, cauliflower, cabbage, and brussel sprouts. Infection occurs when soilborne resting structures called oospores germinate and produce sporangia under moist, cool conditions.
What causes downy mildew in grapes?
Downy Mildew of Grapes. Downy mildew is an extremely serious fungal disease of grapes that can result in severe crop loss. It is caused by the fungus Plasmopara viticola. The pathogen attacks all green parts of the vine, especially the leaves.
What is downy mildew of maize?
Downy mildew on maize leaves is characterised by elongated chlorotic streaks with a downy growth of conidia and conidiophores (Figure 1). Symptoms first appear 3–6 days after infection as pale yellow to whitish discolourations on the leaf blade. Tassels may be deformed, and ears may be aborted.
How are downy mildew differentiated?
The fungus spreads by oospores on diseased leaves and/or on infected seed. The disease spreads in environments with high humidity and favors temperatures between 20-22 °C. Tufts of grayish to pale-colored sporangiophores on the underside of leaves easily distinguish the infection from other foliar diseases.