%0 Journal Article
%T Evaluation of Four Spray Regimes of Monocrotophos for Control of Earias spp. Damage to Seed Kenal (Hibiscus cannabinus L.)
%A T.A. Fadare
%A N.A. Amusa
%J World Journal of Agricultural Sciences
%D 2005
%I IDOSI Publications
%X The effect of timing of monocrotophos application on its efficacy for the control of budworm, Earias spp. on seed kenaf was evaluated for two consecutive seasons in replicated field trials at Moor Plantation, Ibadan, Nigeria. Monocrotophos was applied at the same rate, three times per season over four different kenaf growth phases and its effect (in time) on budworm attack and damages to young plant shoots, flower and capsules was noted. Results showed that spray applications initiated at 50% flower set stage were as effective as those initiated at the flower bud stage for budworm control. Results indicated significant differences between different times of chemical application. However, applications initiated at the flower bud stage gave very low percent budworm damage (12) and larger kenaf seed yields (1,444 kg ha 1) as compared to the unsprayed control treatment that gave high percent budworm damage (25) and smaller kenaf seed yields (672 kg ha 1) in the first season. The results of the second season trial followed a similar trend. There were significant differences between the different things of spray initiation. Applications initiated at the 50% flower set were about as effective as those initiated at the flower bud stage. This treatment gave very low percent lower bud damage (ii) and larger seed yields (1453 kg ha 1) than the unsprayed control that gave larger percent budworm damages (27) and very low yields (690 kg ha 1). From these results, chemical application initiated at the flower bud stage will effectively reduce budworm damages and consequently increase kenaf seed yields.
%K Monocrotophos
%K budworm
%K Hibiscus cannabinus
%K spray regimes
%U http://www.idosi.org/wjas/wjas1(1)/16.pdf