Management of insect pests of bambara groundnut (Viga subterranean (L.) Verdcourt.) with some plant oils in rain forest zone of Owerri, Imo State
Date
2023-03
Authors
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Publisher
Federal University of Technology, Owerri
Abstract
Studies were conducted from March- June for the early season and August- November for the late season of 2016 and repeated same time in 2017 at the Postgraduate Teaching and Research Farm of the Department of Crop Science and Technology, Federal university of Technology, Owerri, Nigeria. A total of 60 treatment combinations were laid out in a 5 x 4 factorial arrangement with three replications fitted into a randomized complete block design (RCBD) for the field trials to evaluate the efficacy of the plant oils (Bush tea Hyptis
suaveolens. (HEO), Stool wood Alstonia boonei. (AEO), Jathropha tanjorensis (JEO,) mixed plant oils from Jathropha, Bush tea and Stool wood bark (J+A+HEO) against field insect pests of Bambara groundnut. Population dynamics of insect pests of Bambara groundnut under control measures with plant oils were also studied. The oils were tested at four rates (0.00, 2.00, 4.00 and 6.00 ml/100 ml of H2O per plot) and Cypermethrin 10EC at the rates of (0.00, 0.20, 0.40 and 0.60 ml/100 ml of water per plot). Some field insect pests including variegated grasshopper (Zonocerus variegatus), Flea beetle (Podagrica uniformis and Podagrica sjostedti), Leaf miner (Aproaerima modicella) and Aphids (Aphids crassivora) inflicted damage to the leaves of Bambara groundnut. The treatment materials provided effective protection against insect pests of Bambara groundnut at different levels when compared to the unsprayed plots. The unsprayed plots recorded highest number of damaged leaves at the vegetative phase, flowering and podding phase followed by the lowest application rates, while the highest application rates recorded the least damaged leaves by insect pests in 2016 and 2017 early and late planting seasons. The results on yield showed that the plant oils were able to reduce the population of insects which resulted in an increase in the 100 Seed and Pod weight (g), Seed and Pod yield (kg/ha, though they were not significantly different (P>0.05).
Description
This thesis is for the award of Doctor of Philosophy (PhD.) in Agricultural Entomology
Keywords
Bambara groundnut, plant oils, cypermethrin, insect pests, population dynamics, Department of Crop Science and Technology
Citation
Nwamkpa, A. P.(2023). Management of insect pests of bambara groundnut (Viga subterranean (L.) Verdcourt.) with some plant oils in rain forest zone of Owerri, Imo State [Unpublished Doctoral Thesis]. Federal University of Technology, Owerri, Nigeria