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- Title
HOST RESISTANCE IN BRINJAL TO MEALYBUG COCCIDOHYSTRIX INSOLITA (GREEN).
- Authors
MOHAN, MITHRA; ANITHA, N.; MANJU, R. V.
- Abstract
An experiment was conducted at College of Agriculture, Vellayani, Thiruvananthapuram, Kerala to ascertain the biophysical and biochemical bases of resistance in brinjal genotypes to the mealybug Coccidohystrix insolita (Green). The cultivar Pusa Uttam (38.58/three leaves) was observed with least number while maximum incidence was with the hybrid Udit (127.58/three leaves). The biophysical parameters like trichome density (adaxial side), length width ratio of leaf and number of branches plant-1 exhibited a significant positive correlation with incidence (correlation coefficients of 0.6917, 0.702 and 0.644, respectively). Of the biochemical parameters, total phenol content exhibited a significant negative correlation (-0.731), while the total protein content and reducing sugar concentration showed a non-significant correlation with incidence. Carotenoids exhibited a non-significant negative correlation in contrast with the total chlorophyll content showing a significant positive correlation. Thus, among the cultivars evaluated, Pusa Uttam was observed to be resistant to C. insolita, with lowest length width ratio (1.32), lower number of branches/plant (2.33), maximum phenol content (4.62 mg g-1) and the least chlorophyll content (1.55 mg g-1). The highly susceptible cultivar Udit was observed with maximum trichome density on adaxial side (1100 / cm²) and length width ratio (1.97); least total phenol content (1.14 mg g-1) and maximum total chlorophyll content (2.84 mg g-1).
- Subjects
TRIVANDRUM (India); DISEASE resistance of plants; EGGPLANT; MEALYBUGS; PHENOL; CHLOROPHYLL
- Publication
Indian Journal of Entomology, 2021, Vol 83, Issue 4, p871
- ISSN
0367-8288
- Publication type
Article
- DOI
10.5958/0974-8172.2021.00026.2