Abstract
The cotton mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae), an invasive pest species, has appeared on a large scale on cotton in India since 2006. Its distribution within the plant, and associated yield losses in cotton, were studied over 2 years. Distribution of P. solenopsis was observed within the cotton plant from vegetative to boll formation stage. In the vegetative and square formation stages, the highest mealybug population was recorded on the upper portion of the stem, followed by the middle leaves of the plant. In the boll formation stage, there was no significant difference in distribution of the insect among plant parts. Losses in cotton due to the mealybug varied between 14.9% at Grade 1 and 53.6% at Grade 4, on a 0 to 4 severity index, with a mean reduction of 35% and 32%, during 2008 and 2009, respectively. There was a significant relationship between severity of infestation and decrease in seed cotton yield. The information generated from this study will help in the early detection of mealybug infestation and estimation of yield losses corresponding to the severity grade of the damage.
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Acknowledgments
We gratefully acknowledge the financial grant provided by World Bank through ICAR, New Delhi to carry out the present study as a part of the National Agricultural Innovation Project at CICR, Regional Station, Sirsa.
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Kumar, R., Nagrare, V.S., Nitharwal, M. et al. Within-plant distribution of an invasive mealybug, Phenacoccus solenopsis, and associated losses in cotton. Phytoparasitica 42, 311–316 (2014). https://doi.org/10.1007/s12600-013-0361-6
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DOI: https://doi.org/10.1007/s12600-013-0361-6