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Studies on population dynamics of hibiscus mealybug, Phenacoccus solenopsis Tinsley in relation to biotic factors were carried on randomly selected hibiscus plants at College Farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari (Gujarat) during 2007-08. Under field condition the observation recorded at fortnightly interval showed that the population of P. solenopsis on hibiscus was observed throughout the year with its peak activity from first fortnight of October to first fortnight of December. The highest population of mealybug per plant was found in first fortnight of November (93.68), exhibited the peak activity of mealybug population. During the course of investigation, the nymph and adult female was found to be preyed by two predators Spalgis epius (Westwood) and Scymnus coccivora (Aiyar). The populations of both predators were directly related to the population of host, P. solenopsis and showed significant positive relationship with mealybug population.
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