Thumbnail Image

Theses

Browse

20211
Reset filters
Subject: Entomology × Author: Bhall, Ritu × End date: 2021 ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    Population dynamics and management of sorghum shoot fly, Atherigona soccata Rondani
    (CCSHAU,HiSAR, 2021-08) Bhall, Ritu; Sharma, Bajrang Lal
    The present investigations were carried outon population dynamics and management of sorghum shoot fly, Atherigona soccata Rondani during Kharif, 2020 at CCS HAU, Hisar. Studies on the population dynamics of sorghum shoot fly revealed that the shoot fly population increased tremendously from 29th to 38th standard week i.e. 135 flies per trap to 243 flies per trap, respectively. The peak shoot fly catch (243 flies per trap) was recorded during the third week of September (38th SMW). Correlation studies of shoot fly population exhibits a significant positive correlation with the maximum temperature (r= 0.35*), minimum temperature (r= 0.65**), evening relative humidity (r= 0.61**) and average wind speed (r= 0.33*). Morning relative humidity (r= 0.38) and rainfall (r= 0.30) exhibited a non-significant correlation however, sunshine hours (r= -0.01) were associated as negatively non-significant. Screening of forty genotypes was done on the basis of number of eggs per five plants, dead heart per cent, seedling vigour, leaf glossiness and plant height. The results revealed that five genotypes were highly resistant against shoot fly excluding the resistant checks viz., IC-305927, HJ-541, HC-308, HC-136 and CSV-44F. Genotypes viz., IS-106, IS-950, IS-36, IS-2058, IS-18388, IS-5, IS-40764, IC-352551, IS-8110, EC-532984, IC-352430, IS-4496, IC-352264, IS-3889, IS-6012, IS-2371, IS-3124, IS-352, IS-3802, IS-7675, IS-4192, IC-352410, IS-7999, IC-352473 and IS-2633 were moderately resistant with dead hearts ranging from 14.93- 32.71 per cent. Five genotypes were highly susceptible, excluding the susceptible checks IS-9543, IC-352261, IS-11393, IS-6286 and IS-3023. Correlation between the number of eggs and per cent dead hearts with plant stand, plant height, leaf glossiness and seedling vigour revealed that resistant genotypes were glossier with good seedling vigour, good plant height and showed maximum number of plants. While, susceptible genotypes had non-glossy leaves, lower seedling vigour with low height and minimum plant stand. Results on management of shoot fly revealed that thiamethoxam 30FS @ 10ml/kg + neem oil @ 2% showed significantly lower shoot fly infestation having good plant vigour (1.00), maximum height (86.93 cm) and highest yield (309.60 q/ha) as compared to other treatments, while spray with karanj oil @ 2% found least effective for controlling sorghum shoot fly. The maximum ICBR was noticed in seed treatment with imidacloprid (1:21) and least in treatment sprayed with karanj oil @ 2% (1:0.78).