Effectiveness and profitability of insecticide formulations used for managing snap bean pests
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Date
2016Author
Otim, M.
Kasina, 1, M.
Nderitu, J.
Katafiire, M.
Mcharo, M.
Kaburu, M.
Bwire7, G. J. Bwire1, G. Cheminingw’a3, F. Olubayo3 and M. Ugen8
Bwire, G
Bwire, J
Cheminingw’a, G.
Olubayo, F.
Ugen, M.
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Snap bean (Phaseolus vulgaris L.) farmers rely mostly on insecticides to manage pests and to
satisfy the stringent market requirements for insect and blemish-free pods. However, the cost of
these pesticides lowers farm incomes. In addition, heavy and wrong use of pesticides could result
in residue accumulation, which reduces market access by the farmers. To identify optimal pest
control with lower economic risks to farmers, we investigated the effectiveness and profitability
of different insecticides and insecticide formulations against bean fly (Ophiomyia spp.) and bean
flower thrips (Megalurothrips sjostedtii). Two separate experiments were conducted during 2009 to
2012. The first experiment targeted bean fly and bean flower thrips, comprising the treatments:
seed dressings, soil drenches, foliar sprays and an untreated control. We used randomised complete
block design, with four replicates. All the seed dressing and soil drenching insecticides, except
Apron, significantly lowered bean fly infestation by two to 60 fold when compared with control.
These insecticides, however, did not control flower thrips. Confidor® resulted in a marginal
returns of 0.89 and Actara® -0.11 compared to seed dressings, which ranged from 0.47 to 1.82. The
second experiment laid in a randomised complete block design involved the foliar application of
Roket® under different spray regimes. Application of Roket® reduced infestation of thrips, and
resulted in positive MRR in all the seasons.
Publisher
University of Nairobi
Rights
Attribution-NonCommercial-NoDerivs 3.0 United StatesUsage Rights
http://creativecommons.org/licenses/by-nc-nd/3.0/us/Collections
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