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Journal of Agriculture and Biological Sciences Vol. 2(3) pp.049-053,June 2011
Available online http://www.globalresearchjournals.org/journal/?a=journal&id=jabs
Copyright ©2011 Global Research Journals.
Review
Effect of Poultry manure rates and vine staking on the incidence and severity of Cylas puncticolis (Curculionidae: Brentidae)on sweet potato (Ipomea batatas Lam).
By
Bamaiyi, L.J., Dauji, L. Z.*, Gabriel, V.K.,* Lyocks, W.S.J.* and Tanimu, J*
Dept. of Crop Protection, Institute for Agricultural Research, Ahmadu Bello University, Zaria
*Samaru College of Agriculture, Ahmadu Bello University, Zaria.
Corresponding Author’s E-mail; lbamaiyi@yahoo.com Tel. No. +2348034502333,
Accepted 4th May 2011.
| Abstract |
Poultry manure rates and vine lifting were evaluated for their effects on yield of sweet potato and incidence of the potato weevil (Cylas puncticolis) during the 2008 and 2009 cropping season in Samaru, Zaria, Nigeria. Five rates of poultry manure (0, 5, 10, 15 and 20 tons/ha) and a recommended fertilizer rate was used as check. The poultry manure was applied by drilling the ridges and applying the manure and covering them back with soil while the fertilizer was applied soon after sprouting by drilling. Vine lifting was done five weeks after planting when the vines started crawling on the ground by staking with pegs. The experiment was laid out in a Randomized Complete Block Design (RCBD). The result showed that at 5 Weeks After Planting (WAP), the poultry manure rate of 5 tons/ha had a significantly higher Cylas puncticolis population than all other manure rates including the fertilizer. At 8 WAP the 15 tons/ha had a significantly higher insect population than all other manure rates. Vine lifting had no effect on the insect population. There was no significant difference between the sweet potato yield of the fertilizer and 5 tons/ha treated plots which were significantly higher than all other manure rates. Vine lifting had a significantly higher yield and high insect incidence than the non-vine lifted plots.
Keywords: Manure rates, vine lifting, Cylas puncticolis, sweet potato, tuber weight, emergence holes.