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 by Asanka Tennakoon* in Current Investigations in Agriculture and Current Research (CIACR) in Lupine Publishers
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%).
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