STUDIES ON MORPHOLOGICAL AND BIOCHEMICAL FACTORS IMPARTING RESISTANCE AGAINST AMERICAN PINWORM, Tuta absoluta (MEYRICK) (LEPIDOPTERA: GELECHIIDAE) AND THRIPS SPECIES IN TOMATO
| dc.contributor.advisor | JAGADISH, K. S. | |
| dc.contributor.author | PRITHA GHOSH | |
| dc.date.accessioned | 2020-10-07T05:54:11Z | |
| dc.date.available | 2020-10-07T05:54:11Z | |
| dc.date.issued | 2019-12-27 | |
| dc.description.abstract | Investigations on morphological and biochemical factors imparting resistance against Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) and thrips species in tomato revealed that egg and larval load of T. absoluta were found to be significantly higher during summer 2018-19, followed by rabi 2017-18 and kharif 2018-19. Four thrips species were recorded namely Gynaikothrips uzeli Zimmermann, Scirtothrips dorsalis Hood, Thrips palmi Karny and Thrips hawaiiensis Morgan from the field screening. Pheromone trap catches of T. absoluta had significant negative correlation with rainfall (r = -0.35*) and relative humidity (r = -0.61*) and significant positive correlation with temperature (r =0.76*). Laboratory bioassays confirmed the resistances of wild accessions of tomato against T. absoluta and TOSPO vector, S. dorsalis by recording significantly lower egg load and higher larval mortality as compared to the susceptible check. Higher acylsugar content had a negative impact on T. absoluta larvae and resulted in reduced pupal weight. Dense glandular trichomes showed highly significant positive correlation (R2=0.94*) with acyl sugar content. Total glandular trichomes showed significant negative correlation with egg load (R2= 0.89*). Wild accessions showed contrasting differences in their green leaf volatile profile as compared to susceptible genotypes. Among biochemical parameters, acyl sugar, tannin, phenol, monoterpene and sesquiterpene contents were found at significantly higher quantity in resistant wild accessions as compared to susceptible genotype. | en_US |
| dc.identifier.other | Th-12567 | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810152695 | |
| dc.keywords | AMERICAN PINWORM, THRIPS SPECIES, TOMATO | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 240 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU | en_US |
| dc.sub | Agricultural Entomology | en_US |
| dc.theme | RESISTANCE AGAINST AMERICAN PINWORM | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | STUDIES ON MORPHOLOGICAL AND BIOCHEMICAL FACTORS IMPARTING RESISTANCE AGAINST AMERICAN PINWORM, Tuta absoluta (MEYRICK) (LEPIDOPTERA: GELECHIIDAE) AND THRIPS SPECIES IN TOMATO | en_US |
| dc.type | Thesis | en_US |