STUDIES ON SEASONAL INCIDENCE, AVOIDABLE YIELD LOSS AND MANAGEMENT OF SUCKING PESTS IN BLACKGRAM (Vigna mungo (Linn.) Hepper.)

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dc.contributor.advisorNARENDRA REDDY, C
dc.contributor.authorRADHIKA, M
dc.date.accessioned2020-09-29T09:36:54Z
dc.date.available2020-09-29T09:36:54Z
dc.date.issued2018
dc.description.abstractThe present investigation entitled “Studies on seasonal incidence, avoidable yield loss and management of sucking pests in blackgram (Vigna mungo (Linn.) Hepper.)” was conducted during rabi 2017-18 at students farm, College of Agriculture, Rajendranagar, Hyderabad. The results on seasonal incidence of sucking pests of blackgram indicated that the population of sucking pests in rabi blackgram were started from 2nd week after sowing and their population were high during the vegetative stages and reached its peak during the reproductive stage and later declined. The correlation studies between leafhoppers and weather parameters revealed that the maximum temperature, rainfall and evening relative humidity showed non significant positive correlation with the leafhopper population, whereas minimum temperature, rainy days and sunshine hours showed non significant negative correlation, while morning relative humidity and evaporation showed significantly positive correlation whereas wind speed showed significantly negative correlation. Correlation between whiteflies and weather parameters revealed that the maximum temperature, morning relative humidity and sunshine hours showed significantly positive correlation with the whitefly population, whereas evaporation showed significantly negative correlation, whereas minimum temperature and rainy days showed non significant negative correlation, while evening relative humidity, rainfall and wind speed showed non significant positive correlation with the whitefly population. The correlation between thrips and weather parameters revealed that the maximum temperature and minimum temperature showed non significant positive correlation with the thrips population, whereas morning relative humidity, rainfall and rainy days showed non significant negative correlation, while evening relative humidity and sunshine hours showed significantly negative correlation whereas wind speed showed significantly positive correlation. Multiple linear regressions equations developed for the sucking insect pests in blackgram with one week lag weather parameters during rabi 2017-18 revealed that all the weather parameters collectively influenced the sucking pest population in the range between 92 to 95 per cent. Estimation of avoidable yield losses due to sucking pests in blackgram during rabi 2017-18 revealed that the avoidable reduction in plant height, number of branches per plant, pods per plant, number of seeds per pod due to insecticides application was 19.14, 19.78, 20.70 and 17.80 per cent respectively and a significantly higher yield was obtained in protected plots i.e. 1028 kg ha-1 , while, comparitively low yield i.e. 759 kg ha-1 was recorded from unprotected plots. The yield increased in protected plots over unprotected was 269 kg ha-1 i.e. 35.44 per cent. The avoidable yield loss was 26.16 per cent by spraying of insecticides i.e. monocrotophos 36 SC and fipronil 5% SC at ten days intervals against sucking pests viz.,whiteflies, thrips, aphids and leafhoppers in blackgram. Among all the insecticides tested imidacloprid WS 70 at 5 g kg-1 was found to be the most effective treatment which was followed by thiamethoxam 25 WG at 3 g kg-1 , imidacloprid 17.8 SL at 10 ml kg-1 , acetamiprid 20 SP at 15 g kg-1 , carbosulfan 25 EC at 30 ml kg-1 and dimethoate 20 EC at 5 ml kg-1 against leafhopper and thrips population in rabi blackgram. Thiamethoxam 25 WG at 3 g kg-1 was found to be the most effective against whiteflies which was followed by imidacloprid 70 WS at 10 ml kg-1 , acetamiprid 20 SP at 15 g kg-1 and imidacloprid 17.8 SL. The least effective insecticides were carbosulfan 25 EC at 30 ml kg-1 and dimethoate 20 EC at 5 ml kg-1 but were found to be superior over the untreated control. There was no significant difference in the seed treatment with different insecticides against percent germination, initial and final plant stand except dimethoate 20 EC at 5 ml kg-1 treated plots and untreated control plots which recorded the lowest. The increase in plant height was found to be in the order of imidacloprid 70 WS at 5 g kg-1 , thiamethoxam 25 WG at 3 g kg-1 and imidacloprid 17.8 SL at 10 ml kg-1 and they were on par with each other and these insecticides were followed by carbosulfan 30 EC at 30 ml kg-1 , acetamiprid 20 SP at 15 g kg-1 and dimethoate 20 EC at 5 ml kg-1 which were on par with each other and lowest plant height was observed in the untreated control plots. Seed treatment with insecticides increased the number of branches per plant in all the insecticidal treatments and the range was found to be 4.53 and 3.20. The highest number of branches per plant was seen in plots treated with imidacloprid 70 WS at 5 g kg-1 and least number of branches per plant was found in control plots. The highest pod yield was recorded in plots treated with imidacloprid WS 70 at 972.00 kg ha-1 followed by thiamethoxam 25 WG at 833.37 kg ha-1 , acetamiprid 20 SP at 805.60 kg ha-1 , imidacloprid 17.8 SL at 764.27 kg ha-1 , carbosulfan 25 EC at 722.23 kg ha-1 and dimethoate 20 EC at 652.67 kg ha-1 and the lowest pod yield was recorded in control plots at 583.33 kg-1 .en_US
dc.identifier.citationD10,282en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810152067
dc.keywordsSTUDIES ON SEASONAL INCIDENCE, AVOIDABLE YIELD LOSS AND MANAGEMENT OF SUCKING PESTS IN BLACKGRAM (Vigna mungo (Linn.) Hepper.)en_US
dc.language.isoEnglishen_US
dc.publisherPROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITYen_US
dc.subEntomologyen_US
dc.themeM.Scen_US
dc.these.typeM.Scen_US
dc.titleSTUDIES ON SEASONAL INCIDENCE, AVOIDABLE YIELD LOSS AND MANAGEMENT OF SUCKING PESTS IN BLACKGRAM (Vigna mungo (Linn.) Hepper.)en_US
dc.typeThesisen_US
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