Pyrilla perpusilla (Walker) (Hemiptera Lophopidae) – Biology and resistance in sugarcane genotypes

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dc.contributor.advisorChand, Hari
dc.contributor.authorKumari, Ranju
dc.date.accessioned2018-02-07T06:54:15Z
dc.date.available2018-02-07T06:54:15Z
dc.date.issued2017
dc.description.abstractPyrilla perpusilla biology and resistance in sugarcane genotypes experiments were conducted during 2016-17. The biology of Pyrilla perpusilla was conducted in the laboratory in the Department of Entomology and the field experiment was laid out at Pusa Farm Sugarcane Research Institute, Dr. Rajendra Prasad Central Agricultural University, Pusa to assess the resistance in different genotypes of sugarcane. Biology of pyrilla under laboratory condition revealed that the eggs were oval and laid in cluster on the under surface of leaves near midrib. Egg cluster length ranged from 12 to18 mm and covered with white fibrils of wax. Freshly laid eggs were white in colour and turning pale yellow prior to hatching. The incubation period were recorded 7 to 9 (8+ 0.4) days. Fecundity was recorded 600 to 800 with an average of 700 + 44.7. The per cent hatching of eggs ranged from 79.2 to 93 (86.1 ± 3.0) per cent. The nymph passed through five nymphal instars to complete the nymphal stage. Total nymphal period ranged from 38 to 56 (47 + 4) days. Nymphs were soft bodied possessing two anal filaments and they gradually increased in size and their colour also changed with an increase in size. Pyrilla perpusilla male and female adults both were almost similar only differ in their size and longevity. Female adults were found to be bigger and also longer longevity than male. Total life cycle of pyrilla from egg to adult was completed within a period of 71 to 99 days with an average of 85 + 6.2 days. The maximum (26/leaf) population of nymphs and adults of pyrilla were recorded on the genotype BO 130 followed by CoP 11438 (23.2/leaf), 23.0/leaf on BO 91 and 21.0/leaf population on CoP 9301 genotype which were highly susceptible based on grade scale, while three genotypes weremoderately susceptible (CoP 11436, CoLK 09204 and CoLK 12209) and remaining seven genotypes were less susceptible (CoP 11437, CoSe 11451, CoSe 95422, CoP 13438, CoP 13439, CoSe 13453 and CoSe 13454) among 14 selected sugarcane genotypes on the basis of nymph and adult population build-up. The absolute population of egg masses, nymphs and adults of pyrilla were noticed in the field from first fortnight of April to second fortnight of November, first fortnight of March to second fortnight of November and second fortnight of March to second fortnight of November, 2016, respectively. The peak population of egg masses (6.6/leaf) and nymph (5.3/leaf) were recorded in the second fortnight of August, 2016, while peak population of adult (21/leaf) was recorded in the first fortnight of August, 2016. The relationship between population of insect (egg, nymph and adult) and weather parameters showed highly significant positive correlation with maximum and minimum temperature i.e. temperature increased the corresponding population of insect also increased. Remaining weather facters(relative humidity at 07 and 14 hrs and rainfall) showed non-significant correlation with population of pyrilla. Various physio-morphic plant-characters(leaf width, leaf length, leaf spines density, cane length, cane diameter)were determined from the fourteen selected genotypes in a view to ascertain the role of these factors towards the resistance/susceptibility against the pest.The leaf-spine density showed highly significant negative correlation with population (egg masses, nymph and adult) of the insect whereas, leaf -width and leaf-length showed highly significant positive correlation. It is clearly indicated that thesugarcane varieties having less leaf spine density;longer and wider leaves are more susceptible for pyrilla population build-up.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810040522
dc.keywordsSugarcane, Pyrilla perpusilla, Biology, Resistance,en_US
dc.language.isoenen_US
dc.pages41+vien_US
dc.publisherDr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)en_US
dc.subEntomologyen_US
dc.subjectnullen_US
dc.themeTo study the biology and resistance of Pyrilla perpusilla in Sugarcaneen_US
dc.these.typeM.Scen_US
dc.titlePyrilla perpusilla (Walker) (Hemiptera Lophopidae) – Biology and resistance in sugarcane genotypesen_US
dc.typeThesisen_US
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