Abstract

The proliferation of pests is most influenced by the host (plants) and other environments including plant distance and humidity. Agriculture research and development departement has been released many varieties of rice but their resistance to pests and diseases on various developmental areas is different. The study aims to determine the population and attacks intensity of Rice Leaf Folder (Cnaphalocrosis medinalis) on farming rice jajar legowo ganda and regular systems (tegel). The research has been carried out on farmers fields in Buntulia Village, Duhiadaa District, Pohuwato Regency from June to October 2019. The study used a Split plot research design with four replications. The main plot is farming rice jajar legowo ganda and regular system. Sub plots are varieties: 1). Inpari 30, 2). Inpari 31, 3). Inpari 42, and 4). Situbagendit. Cnaphalocrosis Medinalis was observed when the plants age 5, 7, 9, and 11 week after planting (WAP) on 30 clumps per plot. The results showed Cnaphalocrosis medinalis attacking on all varieties in both systems. However, Cnaphalocrosis medinalis attacks on the farming rice jajar legowo ganda (average 7.96 %) has as lower as than regular system (av. 3.95 %)) on the observations per weeks. The intensity of Cnaphalocrosis medinalis attacks on Inpari 31 (av. 5.56 %) as lower as than Situbagendit (av. 13.43 %). The result showed highest populations Cnaphalocrosis medinalis was found on regular system (av. 9.35 h / c) lowest Cnaphalocrosis medinalis populations was on the rice farming jajar legowo ganda (av. 7.96 h / c). Highest populations of Cnaphalocrosis medinalis was found on Situbagendit variety and Inpari 30 variety has lowest populations. Cnaphalocrosis medinalis attack intensity, generally increasing with rice age, the population density was relatively decreased because control doing.Keywords: rice leaf folder, planting system, varieties.

Highlights

  • Increasing rice productivity can use new superior variety (NSV) seeds with high yield potential (Husnain et al 2016)

  • Jajar legowo system combined with suitable varieties such as Inpari 30 was effective in reducing damage intensity rates and population of Cnaphalocrosis medinalis

  • The results showed that the regular system had a higher Cnaphalocrosis medinal infestation rate than the ‘jajar legowo ganda’ system

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Summary

Introduction

Increasing rice productivity can use new superior variety (NSV) seeds with high yield potential (Husnain et al 2016). This rice variety was developed with the aim of producing new varieties having characteristics suitable for lowland rice typology, high productivity, pest resistance, and good taste. The new superior varieties have contributed significantly to increasing rice production. The contribution of these new improved varieties to national rice production reaches 56%, while the interaction between irrigation water, improved varieties, and fertilization to increase rice production contributes up to 75% (Syahri and Somantri 2016). The research and development agencies have released many superior rice varieties, but their productivity and pest resistance in each region are different (Saleh and Hipi, 2019)

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