Epidemiology and management of Stemphylium blight of garlic
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Stemphylium blight of garlic caused by Stemphylium vesicarium (Wallr.) Simmons is
commonly found in garlic growing areas of Punjab. The lesions colonized by S. vesicarium
was round to elliptical. The most effective media for growth and sporulation of S. vesicarium
was V8 juice agar media. Maximum disease severity was recorded in Moga district whereas
minimum in Ludhiana. Leaf wetness duration of minimum 8 hrs is necessary for the infection
but maximum disease developed at 24 hrs of leaf wetness duration. The optimum temperature
for the disease development was 25ºC whereas it was nil at 15ºC. The disease severity
increases with the increase in age of the plant and it was found maximum on 105 days old
plants. The garlic plants sown on 6-16 November exhibited minimum disease severity. No
genotype exhibited resistance to disease under natural and artificial epiphytotic conditions.
The performance of PG-17 and PG-18 was better in comparison to other genotypes tested
against Stemphylium blight under artificial epiphytotic conditions. Neem oil and Neem
extract can be used as an alternative to Mancozeb 75% WP for eco-friendly management of
the disease. These can be useful in devising integrated management strategy for Stemphylium
blight of garlic.
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