ALTERNATIVE MANAGEMENT STRATEGIES FOR WEEDS AND ROOT KNOT NEMATODES (Meloidogyne spp) IN ROSE PLANTS GROWN UNDER POLYETHYLENE COVERED TUNNELS

Grace Oloo

ABSTRACT

A field study on alternative ways to manage weeds and nematodes was conducted for two seasons under polyethylene covered growth tunnels in Horticultural Research and Teaching Field at Egerton University in 2005 and 2006. The treatments tested were: Dazomet (83.3g/m2), Metham sodium (0.12g/1): Brassica napus and Brassica juncea applied at 2, 3 and 4kgs/m2. The two brassica biofumigants were planted and uprooted at initial flowering stage and chopped into 10mm small pieces separately before being applied to their respective plots. The biofumigants reduced the number of nematodes by between 25% and 62% compared to the non treated plots, but their activities were quite inconsistent and were insignificant in the second season of study. In both seasons, reinfestation occurred soon after field aeration. However, the highest reduction of the 2nd juvenile stage of root knot nematodes of between 42% and 81% and up to 88% reduction in the emergence of some weeds were observed in the plots treated with Metham sodium at 0.12g/1. The findings of this study clearly show that, metham sodium and dozamet still remain the most effective means of controlling weeds under enclosed environment. Alternatively, weeds can be managed through seed bank depletion. With continuous uprooting of weeds the seed bank is exhausted in the soil and weed population gets redu

 

 

 

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