Yield loss and damage assessment caused by the rice grain bug: a new insect pest of rice in CARAGA Region

Issue Date

10-2013

Abstract

Rive Grain Bug (RGB) is a new insect pest of rice feeding on the panicles preferably during the flowering to milking stages resulting in unified and discolored grains which eventually reduces rice yield and grain quality. This pest is known to occur in Regions 5, 7, 8, 11, 12, and Caraga. In Caraga Region, it is presently confined in the Municipalities of Alegria (Surigao de Norte) Kitcharao (Agusan de Norte) and Talacogon (Agusan del Sur) under rainfed environments. At present, no scientific studies or documentation has been done yet on assessment of yield loss damage caused by the pest. A pot experiment was conducted for two cropping seasons in Alegria, Surigao del Norte and Kitcharao, Agusan del Norte to assess the yield loss and damage caused by RGB and to determine what yield components contribute to yield loss caused by the insect pest. Results in both cropping seasons showed that the uninfested check plants registered the highest of 30 g/hill during the first crop and 22.36 g/hill during the 2nd crop, followed by potted plants infested with 3.5 and 10 RGB adults per hill with 24.5 g, and 20.1 g/hill during the first crop and 18.96, 17.43 and 14.70 g/hill during the 2nd crop, respectively. The potted rice plants infested with 15 RGB adults had the lowest yield of 17.5 g/hill for the 1st crop and 13.30 for the 2nd crop. Results imply that all the potted rice plants infested with 3,5,10 and 15 RGB adults per pot had significant reduction in rice yield ranging from 20 to 41.67 % during the 1st crop and 15.58 to 40.78% during the 2nd crop. Yield loss during the first crop was attributed to high percentage damaged grains ranging from 20 to 40% during the 2nd crop.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

27

Issue

2

Page

212-213

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

INSECTA; PLANT DAMAGE; PESTS OF PLANTS; INFESTATIONS; DAMAGE ASSESSMENTS; PHILIPPINES

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