The effect of infestation with rice water weevil (Helodytes foveolatus Duval) on the growth and development of rice (Oryza sativa L.) in Guyana

Authors

  • Narita Chandrawattie Singh Guyana Rice Development Board Rice Research Station
  • Dharamdeo Singh University of Guyana Turkeyen & Tain Campus
  • Gyanpriya Maharaj University of Guyana
  • Mahendra Persaud Guyana Rice Development Board Rice Research Station

DOI:

https://doi.org/10.37234/TA96012019/0000960109

Keywords:

Rice water weevil larvae, plant development, panicle emergence, panicle density

Abstract

Rice (Oryza sativa L.) production, the largest agricultural sub-sector in Guyana, is greatly affected by insect pests. The rice water weevil (Helodytes foveolatus Duval) is an early-season pest of rice at both the adult and larval stages with the latter resulting in the greater yield loss. This study compared the growth and development of rice plants subjected to varying levels of water weevil larvae infestation. Plants were infested with 3, 5, and 7 larvae/plant at two periods: 18 and 30 days after sowing (DAS). Uninfested plants served as the control. Each treatment was replicated five times and plant height, tiller count, panicle emergence and panicle density were recorded. Results showed that there were significant differences in plant height at maturity and throughout the trial, for infestation treatments applied at 18 and 30 DAS. At maturity, a similar trend was observed in the number of tillers produced by the various treatments; plants infested at 18 and 30 DAS with 7 larvae/plant had significantly lower number of tillers than the control and plants infested with 3 and 5 larvae/plant (P=0.03 and P=0.02) respectively. Panicle emergence and panicle density were also influenced by the number of water weevil larvae per plant and the length of time of infestation. This study proves that growth and development of rice plants can be affected by the level of infestation and the time of infestation of rice water weevil larvae. This can be useful in determining the amount of damage caused by the pest and therefore indicate to farmers whether or not control measures should be applied.

Author Biographies

Narita Chandrawattie Singh, Guyana Rice Development Board Rice Research Station

Food Safety & Quality Assurance Researcher

Head of Value-added / Post-harvest Department

Rice Research Station

Dharamdeo Singh, University of Guyana Turkeyen & Tain Campus

Lecturer

Faculty of Forestry & Agriculture 

Faculty of Natural Sciences

University of Guyana

Gyanpriya Maharaj, University of Guyana

Director, Centre for the Study of Biological Diversity,

Faculty of Natural Sciences,

Turkeyen Campus,

University of Guyana

Mahendra Persaud, Guyana Rice Development Board Rice Research Station

Chief Scientist / Plant Breeder

Rice Research Station

Guyana

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Published

2020-03-21