Centralized screening for resistance to major insect pests of rice
2019
Santiago, G.C.
Insect resistance is the totality of heritable qualities that enable a plant to reduce or withstand damage insects inflict on it. Insect resistant varieties are major elements in the development of pest resistant rices aims to help farmers increase rice production. Evaluation of different lines for resistance against major pests was conducted under field and screenhouse conditions. In the field, rice lines from different ecosystems were planted late to meet the required pest pressure for evaluation against stem borers (SB). In the screenhouse, compartment seed-boxes were used to evaluate the entries against brown planthopper (BPH) and green leafhopper (GLH). NCT manual and Standard Evaluation System, (SES) of IRR [International Rice Research Inst.] were followed. During 2018 DS, 248 entries were evaluated under field conditions against SB, and under the screenhouse conditions against BPH and GLH. A low SB pressure was observed during vegetative and reproductive stages, hence , data were not valid. Most entries were intermediate to BPH and GLH in the screenhouse. In August, 2018, 560 entries were planted. These were also evaluated against SB, BPH, and GLH. Insect pressure was very low during the vegetative stage. Evaluation during reproductive stage was not valid due to rice tungro infection on susceptible check TN1. Evaluation in the screenhouse and showed the most entries were intermediate to BPH and GLH. The results will help avoid recommending highly susceptible selections as commercial varieties.
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