Resistance of promising hybrids to insect pests and diseases

Issue Date

10-2003

Abstract

Use of hybrid rice has been recognized as one approach for increasing rice production and attaining rice self-sufficiency in the Philippines. Mestizo is the most popular hybrid rice in the country at present and has been recommended throughout the country for commercial cultivation. It is of prime importance that parental lines and promising hybrids should possess resistance to at least the major insect pests and diseases to minimize yield losses due to pest damage. This study was conducted to determine the reactions of parental lines and promising hybrids to major insect pests and diseases and to identify resistant progeny and parentals that can be used in the development of superior hybrids for commercialization. Entries were evaluated under screenhouse and field conditions during the 2002 dry and wet seasons. The seedbox screening method was used for brown planthopper (BPH) and green leafhopper (GLH) and natural infestation for stemborer evaluation in the field. Screening for major diseases was done by induced and modified methods. One hundred ninety entries were evaluated inh the field during the dry season and 386 during the wet season. Eleven hybrid parentals showed resistant reactions to blast but none to black bug (BB), rice tungro virus (RTV), GLH and BPH. IR57298-174-2-2R was the only entry rated moderately resistant (MR) to GLH although it was susceptible to BPH. During the wet season, four entries showed intermediate reactions to BP, namely: MRH007, SL1, SL8 and PR31215H. Among the hybrid parentals evaluated in the field, entries IR60819-34-2R and PR22896-225R showed resistant reaction to BB. One entry GUI99R, showed resistant reaction to BLS and 10 entries to sheath blight.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

189-190

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

NILAPARVATA LUGENS; NEPHOTETTIX VIRESCENS; ORYZA SATIVA; STEM EATING INSECTS; PEST INSECTS; RICE TUNGRO VIRUS; PLANT DISEASES; PLANT GENETICS; PLANT PESTS; DISEASE RESISTANCE; PLANT BREEDING; HYBRIDS; WET SEASON; DRY SEASON

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