Rapid screening of rice genotypes for resistance to brown planthopper, Nilaparvata lugens (Stal)

Abstract

The brown planthopper (BPH), Nilaparvata lugens (Stal) is still dominating and considered as an important insect in rice and causes considerable yield losses. Host plant resistance is an effective and environment friendly approach to manage the insect pest and screening is a continuous process to identify the resistant sources. With changing climatic conditions and development of biotypes or strains necessitate quicken the process of screening and identification resistant lines time to time. Standard seed box method has been followed for several years and identifying resistant at seedling stage is important process to initiate further identification of resistant factors and development of varieties. In the present study attempts were made to screen the advanced rice entries in protray and standard seed box methods. The reaction of rice entries to BPH in both methods are discussed. The advantage of protray screening and few limitations in the seed box method are described.