Browsing by Author "Sobita Simon"

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Distribution of root-knot nematode on major field crops in Uttar Pradesh (India)
(2011) Anamika; Sobita Simon; K.P. Singh; G. Ghosh
An extensive survey was conducted (2007-2009) to assess the incidence and intensity of root-knot disease on field crops especially rice and vegetable crops in 21 districts, representing the major production centre in Uttar Pradesh (India). Based on incidence, population density and associated damage on affected crops, Meloidogyne species were considered to be the most important parasites of the crops under local condition. The increasing occurrence and damage of this nematode to tomato, rice, brinjal, okra, cowpea, cucurbits, onion, pumpkin and bitter gourd grown in northern India was recently documented. Heavy galling was caused in many crops including rice, tomato, okra, cowpea, onion, pumpkin, brinjal and bitter gourd; also root decay or reduced root system was common among these crops. Attacked plants had yellowish foliage, unthrifty growth and small slow growing fruits and poor yields. The extent of crop losses depends on the initial nematode population, susceptibility of the crop, cropping sequence, age of the plants, soil fertility and involvement of secondary pathogens. © 2011 Taylor & Francis.
Occurrence of root-knot disease in green onion in Allahabad
(2011) Anamika; Sobita Simon; R.K. Singh
Onion is an important indispensable item in every kitchen as condiment and vegetable, hence commands an extensive internal market. The green leaves and immature and mature bulbs are eaten raw or used in preparation of vegetables. Among the various pests and diseases associated with onion, the root knot nematode (Meloidogyne incognita) had proved itself as an important limiting factor for successful cultivation of this crop. Recently root-knot nematode was observed to cause serious losses to green onion crop grown mostly in the field located near the Jamuna & Ganga river belt of Allahabad and the surrounding area in U.P. Differential host test was done to confirm the root knot disease in onion. The specific identity of the nematode was determined by cutting perineal pattern of the females and was confirmed as Meloidogyne incognita. © 2011 Taylor & Francis.