The effect of Neem Seed Water Extract (NSWE) on insects and
growth performance of eggplant (local garden egg) was evaluated
in the field from June to October 1998 at Ekoso in the Eastern
region, Ghana. The extract was applied at the rate of 75 g of
seed per litre of water and compared with a standard insecticide
(Karate), a registered Bacillus thuringiensis Berl. (Biobit) and
water only as control. The effect of each treatment on leaf,
shoot and fruit damage caused by defoliators, shoot, bud, and
fruit borers were determined. The influence of the treatments on
plant biomass and other vegetative growth indices such as plant
height, plant girth, number of functional leaves and branches
per plant, flower production as well as fruit yield were also
assessed. Water traps were used to monitor the effects of the
various treatments on the abundance of insects associated with
the crop. Economic benefits of each pesticide-use programme
based on crop value, cost of pest control and net profits were
Karate and NSWE treatments significantly (P<0.05) reduced
percentage fruit damage, number of borers per fruit and
defoliation. Although NSWE could not effectively control shoot
and bud borers as Karate, it performed better (P<0.05) in
reducing percentage borer damage than either Biobit or control.
The neem seed extract significantly (P<0.05) promoted
vegetative growth than the rest of the treatments, but delayed
flower initiation. Fruit yield per plant did not differ
significantly (P>0.05) among Karate, NSWE and Biobit treatments.
All three treatments, however, produced higher yields than the
control plots with Karate-treated plots recording numerically
higher yield followed by NSWE.
Net profit obtained from Karate treatment was higher
((211,187,772.00) per hectare compared with that of NSWE
treatment ((£8,747,772.00). However, NSWE performed better than
Biobit, which recorded a net profit of (£6,283,852.00/ha. Control
plot had the least net profit of ct5,752,772.00/ha.
Insects from seven major orders (Coleoptera, Lepidoptera,
Odonata, Orthoptera, Diptera, Hymenoptera and Hemiptera) were
found associated with the local garden egg. Fewer numbers of
predators, mainly hymenopterans, were collected from plants
treated with Karate compared to either NSWE- or Biobit- treated
plots. This indicates that Karate had adverse effects on
beneficial insects in the garden egg ecosystem.
The major pest complex of garden egg included Leucinodes
orbonalis Guen. which attacked the shoots and fruits, the bud borer Scrobipalpa blapsigona Meyrick, Pachnoda spp. which
scraped and chewed stem and defoliators comprising Acraea
peneleos peneleos Ward., A. pharsalus pharsalus Ward., Zonocerus
variegates L., Eulioptera spp. and Phaneroptera nana Stal.
Neem seed water extract can be used as alternative to
synthetic insecticide for the control of local garden eggs by
resource poor farmers.
CDR, C (2021). Evaluation Of Neem Seed Water Extract, Biobit And Karate On Insect Abundance And Yield Of Local Garden Egg (Solanvm Integrifolium L.). Afribary.com: Retrieved April 10, 2021, from https://afribary.com/works/evaluation-of-neem-seed-water-extract-biobit-and-karate-on-insect-abundance-and-yield-of-local-garden-egg-solanvm-integrifolium-l
Coalition, CDR. "Evaluation Of Neem Seed Water Extract, Biobit And Karate On Insect Abundance And Yield Of Local Garden Egg (Solanvm Integrifolium L.)" Afribary.com. Afribary.com, 06 Apr. 2021, https://afribary.com/works/evaluation-of-neem-seed-water-extract-biobit-and-karate-on-insect-abundance-and-yield-of-local-garden-egg-solanvm-integrifolium-l . Accessed 10 Apr. 2021.
Coalition, CDR. "Evaluation Of Neem Seed Water Extract, Biobit And Karate On Insect Abundance And Yield Of Local Garden Egg (Solanvm Integrifolium L.)". Afribary.com, Afribary.com, 06 Apr. 2021. Web. 10 Apr. 2021. < https://afribary.com/works/evaluation-of-neem-seed-water-extract-biobit-and-karate-on-insect-abundance-and-yield-of-local-garden-egg-solanvm-integrifolium-l >.
Coalition, CDR. "Evaluation Of Neem Seed Water Extract, Biobit And Karate On Insect Abundance And Yield Of Local Garden Egg (Solanvm Integrifolium L.)" Afribary.com (2021). Accessed April 10, 2021. https://afribary.com/works/evaluation-of-neem-seed-water-extract-biobit-and-karate-on-insect-abundance-and-yield-of-local-garden-egg-solanvm-integrifolium-l