The 2nd African Organic Conference – Mainstreaming ... - ICROFS

2 nd AFRICAN ORGANIC CONFERENCE 2012
May 2-4, 2012 in Lusaka, Zambia
Environmental Biology, University of Ibadan, Nigeria between July and September, 2005. Three varieties
of C. olitorius were planted on 1.8 x 6m bed at 40 stands per variety. The experiment was laid out in a
Randomized Completely Blocked Design (RCBD). Six weeks after planting, results showed that variety
Eletieku with architectural characteristics of plant height (11cm) and 10 leaves / stand was the least
damaged. An increase in the morphophysical characteristics of C. olitorius led to an increase in number of
infesting larvae per plant. Variety Eletieku also contained a significantly (p>0.05) higher content of crude
fire (37%), crude protein (38%), ash (38%), dry matter (39%) and fat (44%) than other varieties. The study
revealed that variety Eletieku, a Nigerian variety of C. olitorius, is comparatively resistant to damage by A.
terpsichore than Angbadu and Yaya respectively. It showed that it is the plant architecture that confers
resistant and tolerance against field infestation of this vegetable by Acraea terpsichore.
Keywords: Acraea terpsichore, Corchorus olitorius,Yaya, Angbadu, and Eletieku
COMPARATIVE&EVALUATION&OF&MODIFIED&NEEM&LEAF,&WOOD&ASH&AND&NEEM&LEAF&
EXTRACTS&FOR&HYMENIA&RECURVALIS&CONTROL&ON&AMARANTHUS&SPP.&IN&IBADAN&
SOUTHWEST&NIGERIA&
1 ADEROLU, I.A; 2 OMOLOYE, A.A; 1 OKELANA, F.A; 1 OLUBAMIWA, O.O; 1 AKANBI, S.O; 1 ASOGWA, E.U;
3 OJO J.A.
1 Cocoa Research Institute of Nigeria (CRIN), P.M.B 5244, Ibadan, Nigeria
2 University of Ibadan, Ibadan, Nigeria
3 Kwara State University, Nigeria
E-mail:adeisma@yahoo.com
Abstract
The experiment evaluate the effectiveness of neem leaf, wood ash extracts, modified neem leaf extract and
Karate as pest control in amaranthus. The organic treatment extracts: neem leaf extract, wood ash extract
and modified neem leaf extract were compared with Karate and control, replicated four times and arranged
in randomized complete block design. The results showed that there were significant differences (P < 0.05)
in the insect population, number of damaged leaves, and growth and yield parameters of amaranthus under
different treatments compared to the control treatment. The modified neem leaf extract performed better in
reduction of damaged leaves, insect population and yield of amaranthus than the sole application of neem
leaf and wood ash. Modified neem leaf extract increased leaf area, plant height and stem diameter of
amaranthus by 13%, 3% and 6% respectively compared to the neem leaf extract. Generally, modified neem
leaf extract had the best values of amaranthus growth parameters followed by Karate, neem leaf and wood
ash extracts respectively. Modified neem leaf extract decreased significantly insect population and number
of damaged leaves by 42% and 70% respectively compared to neem leaf extract. When compared to
modified neem extract, Karate decreased number of damaged leaves per sample plot by 58%. However,
there was no significant difference between karate and modified neem extract for insect population. For
yield parameters, modified neem leaf extract significantly increased amaranthus yield gains by 17%, 16%
and 7% compared to neem leaf, wood ash extracts and karate treatments respectively. However, wood ash
and neem leaf extracts did not affect amaranthus yield significantly. Therefore, modified neem leaf extract
applied at 1200L/ha was most effective for the pest control.
Keywords: Organic treatment extracts, Karate, Control, Insect population, Yield parameters
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BOOK OF ABSTRACTS