Determination of Additional Parameters for Screening of Different Tea Cultivars against Shot Hole Borer: Comparative Assessment on Relationship of Plant Growth Parameters with Galleries in the Stem
Journal Title: Current Investigations in Agriculture and Current Research - Year 2018, Vol 1, Issue 4
Abstract
Shot whole borer (Xyleborusfornicatus Eichh.) (SHB) is considered as the most serious and economically important pest in tea plantations in Sri Lanka. Present study was done to determine the parameters for screening of different tea cultivars against SHB. Prune time assessments on plant growth parameters of plant breeding trials were used to correlate data on galleries per 30cm in the laboratory bioassay to determine their relationship on SHB infestation in tea. A set of new tea cultivars with known tolerant and susceptible cultivars were used in the study. The regression analysis indicated that the intermodal length, mean number of prune cuts and mean prune weight had a significant positive relationship (P<0.05) with SHB infestation and those could be considered as valid parameters for cultivar screening against SHB in tea. Formulated multiple regression model [Galleriesper 30cm units= (-8.27)+(0.1183 X1)+(1.987 X2), where; X1-mean number of prune cuts, X2-internodal length], was significant (P=0.007) and it explained 56.05% variation of galleries per 30cm (R2=56.05%). Mean number of galleries per 10cm stem had a significant (P<0.05) positive relationship (0.65) and the model explained 41.62% variation of galleries per foot (R2=41.62%).Tea, Camellia sinensis (L.) o. Kuntze, is the main export crop and the second largest foreign exchange earner in Sri Lanka. Contribution of Tea to GDP of Sri Lanka is 2.6% [1,2]. Tea, which is grown in monoculture with shade trees, cover crops, mulches and hedgerows, provides a suitable environment for pests [3] to breed, disseminate and feed. Factors like weather changes, management practices, weeds, pest and diseases create stress conditions to Tea crop and affect its growth, yield quality, quantity and sustainability. In Sri Lanka, pests attack to Tea has become a severe problem as it would directly affect the yield and influence the national GDP in return. A wide range of insects (46 species) and mites (5 species) have been recorded as pests, causing damage to Tea at varying degrees [4]. Shothole borer (XyleborusfornicatusEichh.) (SHB) is the most serious and economically important perennial pest of Tea plantations in Sri Lanka [5], and has remained in nearly two thirds of the country's tea lands. Severe damage is evident in growing areas between elevations of 600-1200m [5].
Authors and Affiliations
Asanka Tennakoon, R Rajapakse, K Mohotti, A Mannakkara, RHK Rathnappriya, Salinda Sandamal
Keywords
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- EP ID EP570187
- DOI 10.32474/CIACR.2018.01.000117
- Views 55
- Downloads 0
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