Evaluation of indigenous botanicals agains rice hispa

Aphidicidal activity of some indigenous plant extracts against bean aphid Aphis craccivora Koch (Homoptera: Aphididae)

“…Our results are close to some of the abovementioned Wndings and especially very similar to Rabbi et al (2003) and Grewal (1989), who used water extracts of leaves at 10% concentration (Table 2). However, applications of organic solvent extracts also caused high percentage of mortalities (Table 2).…”

“…These are biodegradable, and are nontoxic to predators and other fauna. A. indica leaves (cold water) 1 89 C. quinquefasciatus Khan and Howlader (2001) C. procera leaves (cold water) 1 94 C. quinquefasciatus Khan and Howlader (2001) I. sepiaria leaves (cold and hot water) 10 10-20 D. armigera Haque et al (2002) I. sepiaria and P. hydropiper leaves (hot water) 10 86-100 D. armigera Rabbi et al (2003) C. procera leaves (hot water) 10 100 A. composticola Grewal (1989) A. indica (petroleum ether) 4 100 L. erysimi Singh and Arya (2004) A. indica oil (N-hexane) 10 62.2-83 R. dominica, S. granarius, T. castaneum and T. granarium Anwar et al (2005) A. indica and P. hydropiper leaves (ethanol) 4 8 0 . 1 R. dominica Amin et al (2000) P. hydropiper leaves (benzene) 0.5 100 N. lugens Jena (2000) I. sepiaria leaves (ethanol) 10 100 D. armigera Haque et al (2002) I. sepiaria leaves (ethanol) 6 74 C. maculatus Rahman and Talukder (2006) …”

“…Haque et al (2002) recorded very low mortality (10-20%) of rice hispa, Dicladispa armigera (Olivier), in mylar cages using both cold water and hot water extracts (10%) of I. sepiaria. In net house experiments, hot water extracts of leaves of Table 1 Relative eVectiveness (percent mortality), yield (kg per plant) and percent increase in yield over control of some phytoextracts against the bean aphid A. craccivora * Each mean mortality and yield followed by a diVerent letter is signiWcantly diVerent at P (Rabbi et al 2003). Grewal (1989) reported that the hot water preparation of the leaf-extracts of C. procera was highly toxic (100% mortality) to the mycophagous nematode, Aphelenchoides composticola Franklin, at 10% concentration (Grewal 1989).…”

“…There are fewer reports on the other three plants; however, there have been several studies on the eYcacy of extracts (organic solvents and water) from C. procera (Grewal 1989;Khan and Howlader 2001); P. hydropiper (Jena 2000;Bhuiyah et al 2003;Rabbi et al 2003;Islam 2002, 2005) and I. sepiaria (Haque et al 2002;Mollah and Islam 2002;Bhuiyah et al 2003;Rabbi et al 2003;Rahman and Talukder 2006).…”