Seasonal incidence of Raoiella indica Hirst (Acari: Tenuipalpidae) on different varieties of date palm in Kachchh region of Western India

Joshi, Manishkumar; Madiyan Muralidharan, Chandera; Mohan Sharma, Kapi; Sanjabhai Patel, Prakash; Raj Varadharasu, Prithiv

doi:10.22073/pja.v12i1.76729

Seasonal incidence of Raoiella indica Hirst (Acari: Tenuipalpidae) on different varieties of date palm in Kachchh region of Western India

Document Type : Original Article

Authors

Manishkumar Joshi ¹

Chandera Madiyan Muralidharan ²

Kapi Mohan Sharma ³

Prakash Sanjabhai Patel ⁴

Prithiv Raj Varadharasu ⁴

¹ Department of Entomology, S. D. Agricultural University, Sardarkrushinagar, Gujarat (India)

² Date palm Research Station, S. D. Agricultural University, Mundra, Gujarat (INDIA)

³ Assistant Research Scientist, Date palm Research Station, S. D. Agricultural University, Mundra, Gujarat (INDIA)

⁴ Department of Entomology S. D. Agricultural University, Sardarkrushinagar, Gujarat (INDIA)

https://doi.org/10.22073/pja.v12i1.76729

Abstract

The data on abundance showed that the incidence of Raoiella indica and Stethorus keralicus was highest on Barhee and lowest on Anand TC variety, while moderate incidence was observed on KCCL-169. The incidence was observed throughout the year 2020–21 and 2021–22. The highest population was recorded in June and it was lowest during December. Among the four directions, maximum population was recorded from south and lowest from east throughout the year. Correlation studies revealed that S. keralicus, maximum temperature, minimum temperature, maximum relative humidity, minimum relative humidity, wind speed and evaporation showed highly significant positive correlation with incidence of R. indica, while, rainfall and rainy days showed non-significant positive correlation. However, bright sunshine hour exhibited non-significant negative correlation with incidence of R. indica. These results clearly showed that natural enemies are density-dependent and have a close association with R. indica population.

Keywords

Date palm

India

mite

seasonal incidence

weather parameters

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