Egg parasitization by Anagrus sp. (Hymenoptera : Mymaridae) on brown planthopper, Nilaparvata lugens (Stal) in hybrid and inbred rice varieties

Issue Date

10-2013

Abstract

A field study at PhilRice CES determined the degree of brown planthopper (BPH) egg parasitism by Anagrus sp.in two hybrid (PSB Rc72H or M1 and NSIC Rc196H or M16) and two inbred (NSIC Rc 160 and Rc216) rice varieties. Trap plants having the same age and variety as of those planted in the field were exposed at 21, 35 and 49 DAT. Hopper population was also recorded at weekly interval starting at 21 DAT to 49 DAT. The percent egg parasitism of Anagrus sp. in all varieties ranges from 5.27-69.13. However, percent egg parasitism was higher in hybrid rice at the early stage of crop growth (21 DAT) while at 49 DAT egg parasitism was higher in inbred varieties. In all varieties, the decrees in egg parasitism by Anagrus sp. resulted in the increase of the population of BPH indicating the parasitoids' importance in regulating the hopper population. The highest mean percent parasitism was obtained at 35 DAT during WS with 69.13 in M1, while population of BPH was highest at 49 DAT with 11BPH/hill. Generally, percent egg parasitism by Anagrus sp. and the population of BPH was higher during the wet season than dry season.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

27

Issue

2

Page

201

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

NILAPARVATA LUGENS; ORYZA SATIVA; HYBRIDS; PESTS OF PLANTS; PARASITE CONTROL

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