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The brown planthopper (BPH) causes serious damage to rice by sucking rice sap, ovipositing in rice tissues, and transmitting a number of rice diseases during its long-distance migration that severely affect the productivity of paddy. Thus, the aim of this study is to investigate the effectiveness of biopesticides against BPH population. BV500WS is used at the early stage of paddy cultivation for growth enhancement meanwhile BV612EC is used a week after the liberation of BPH for crop protection. Three conditions were adopted as follows which are T1 where the paddy was sprayed using BV500WS and BV612EC to study the effectiveness of both types of biopesticides, T2 where the paddy was sprayed using BV500WS only and C1 where the paddy was cultivated without any pesticide application as control. BPH was released twice on day 46 and 59 of paddy cultivation. Reduction of BPH population with up to 100% mortality rate was observed with the application of two types of biopesticides at T1 resulting in the highest number of remaining tillers with 68.56%. Although severely affected by BPH, T2 was able to has comparable number of remaining tillers as C1 which was 46.24% and 49.65% respectively. These results showed that two types of biopesticides were more effective in reducing BPH compared to one type of biopesticide.

There is an urgent need to enhance the productivity of irrigated paddy fields to increase the rice production that meets population growth. The focus of this study is to investigate the effectiveness of biopesticides in enhancing the paddy growth for yield improvement after controlling the pest and rice diseases. This study aims to determine either one or two types of biopesticides should be used in paddy cultivation. Thus, three conditions were adopted in paddy cultivation at the insect house as follows; T1 where the paddy was sprayed using BV500WS and BV612EC to study the effectiveness of the biopesticides, T2 where the paddy was sprayed using BV500WS only and C1 where the paddy was cultivated following the conventional technique as a control. BV500WS was sprayed into T1 and T2 on the first day of paddy growth while BV612EC was sprayed later into T1, at 55 and 67 days of paddy cultivation a week after releasing the brown planthopper (BPH). Based on the analysis of correlation obtained for each growth, application of BV500WS and BV612EC of T1 resulted in better performance in terms of height of plant, number of tillers, width of leaves, and number of leaves compared to T2 and C1. The excellence performance of plant growth at T1 produced the highest paddy yield of 2304.20 ± 491.42 g−2, while T2 produced comparable yield as C1 which are 663.88 ± 128.41 g−2 and 665.42 ± 183.30 g−2 respectively. Hence, organic plants based biopesticides are successful in enhancing the plant growth of paddy and ultimately increase the paddy yield.