Abstract
Possible causes of brown plant hopper resurgence were determined at the net-house of Entomology Division of Bangladesh Rice Research Institute (BRRI) during 2015. Causes of resurgence in the form of resurgence ratios were higher with acetamiprid, acephate, chlorpyrifos, cypermethrin, deltamethrin, fenvalerate, lambda cyhalothrin, thiamethoxam insecticides compared to imidacloprid, cartap, dinotefuran, isoprocarb /MIPC, phenthoate, pymetrozine when even applied at recommended dose. However, thiamethoxam, imidacloprid, isoprocarb / MIPC and cartap applied at sub-lethal dose produced higher resurgence ratio of BPH than others. Isoprocarb / MIPC, a commonly used recommended insecticide was found to have a higher resurgence ratio with the insecticide treatment at the egg stage (1.71) and combination of all stages (0.82). These insecticides influenced on the growth and reproductive physiology of rice brown planthopper and consequently resurgence ratio ranged increased.
 SAARC J. Agri., 18(1): 117-128 (2020)
Highlights
Rice (Oryza sativa L.) is one of the world’s most important crops providing a staple food for more than half of the global population (Muthayya et al, 2014)
The data of table 3 clearly showed that the resurgence ratio was significantly higher in T6 (2.06) followed by T7, T1, T11 and T9
Moderate resurgence ratio was found in T14 (1.07) and it was not significantly different with resurgence ratio of T2 (1.03) and T5 (1.02)
Summary
Rice (Oryza sativa L.) is one of the world’s most important crops providing a staple food for more than half of the global population (Muthayya et al, 2014). A large complex of pest organisms, consisting of insects, vertebrates, disease and weeds, have been associated with rice for hundreds of years (Islam and Catling, 2012). There are more than 232 insects (Ali et al, 2017) and several vertebrate pest species, which cause damage to the rice plants (Islam et al, 2003). Out of this large complex, about 20-30 species may be considered as the major pests and these have the potential to cause significant yield loss (Krishnaiah et al, 2008). Nowadays its outbreak is occurring frequently in different areas of Bangladesh (Ali et al, 2014), Sri Lanka (Sivasubramaniam and Imthiyas, 2018) and many other countries
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