Incidence of pests and natural enemies in hybrid rice production system

Issue Date

10-2003

Abstract

This study was conducted to determine the profile of major rice insect and other pests and natural enemies associated with hybrid rice (PSB Rc72H) production and to assess the impact of beneficial organisms on pest populations. Two sites each were selected in Nueva Ecija, Isabela, Iloilo, and Mindanao. In Nueva Ecija, high populations of white-backed planthopper (WBPH), green leafhopper (GLH) and brown planthopper (BPH) were observed in both parental lines of PSB Rc72H and inbred (as check) during the dry season (DS) and wet season (WS). Hopperburn damage was observed in Bacal 2 and PhilRice Maligaya [Philippine Rice Research Inst., Munoz, Nueva Ecija, Philippines] during the DS [dry season]. Presence of natural enemies such as mirid bugs, spiders, lady beetles, damselfly and wasps was also noted. Incidence of bacterial blight was observed in both parental lines during maximum tillering and booting stages in Sto Domingo and Matingkis. Leaf blast was noted in the inbred in Matingkis. The golden apple snail (GAS) has the highest population on inbred, AXR and AXB lines in Digos City. Spider (web forming) had the highest population but only on AxB. Rice bug, leaf folder and stemborer were the abundant insect pests in Hagonoy, Davao del Sur. Natural enemies such as spider, wasp, beetle and damselfly were dominant. On the other hand, occurrence of sheath blight was observed both in hybrid, inbred and AXB production areas. The predominant pests found in Isabela were BPH, WBPH, GLH and rice bug and the natural enemies were spiders, lady beetle and mirid bug. The peak of colonization of herbivores and natural enemies were at panicle initiation stage which continued even after crop harvest. It was observed that the disease pressure and population of insect pests in Iloilo were low. Generally, the damage caused by insect pests was minimal in all study sites.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

189

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

NILAPARVATA LUGENS; NEPHOTETTIX VIRESCENS; ARANEAE; ORYZA SATIVA; STEM EATING INSECTS; PEST INSECTS; PLANT PESTS; HYBRIDS; WET SEASON; DRY SEASON; PHILIPPINES

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