Investigating the Effects of Host Grains on the Rice Weevil, Sitophilus oryzae (L.)

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Investigating the Effects of Host Grains on the Rice Weevil, Sitophilus oryzae (L.)

November 14, 2020 Biological Science 0

The present study was conducted to observe the effect of host preference on Sitophilus oryzae, the most cosmopolitan pest that causes severe losses in rice, maize, barley, wheat, on ovipsis, adult emergence, adult body length, longevity and sex ratio. Investigations into the production of S. were carried out. Oryzae in laboratory conditions on the four major cereal crops of maize, rice, chick pea, and millet. The mean developmental time from egg to adult varied, with maize (32.5 days) being the lowest and millet (43 days) being the maximum. The male and female body length also differed in the test grains. Overall, the body lengths of the females in all the test grains were found to be longer than males. The fertility and longevity of the various grains have also been altered. With 453 adults over a lifetime of 184 days, the highest fertility and longevity were found in maize. The female: male ratio was not found to vary significantly in maize, rice and millet with regard to fertility. A substantial decrease (maize- 2.36:1, rice- 2.35:1 and millet- 2.21:1) was observed in chick peas, i.e. 1.98:1. The current study showed that there was a linear association and a strong connection between grain loss and the amount of adult emergence. All the stages of the life cycle were found to be highest in the maize, starting from the form of egg laying to the emergence. The study also indicates that maize was rich in carbohydrates, which increased the insects’ size, fertility and longevity. Therefore, maize is the best grain suitable for rising S. Insects of Oryzae.

Author (s) Details

Miss. Bhumi Thakkar
Division of Entomology, Department of Zoology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara- 390002, India.

Prof. Pragna Parikh
Division of Entomology, Department of Zoology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara- 390002, India.

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