Field efficacy of different bio-inputs and insecticides against melon fruit fly, Zeugodacus cucurbitae (Coquillett) in bitter gourd was carried out in farmer’s field. The effect of different bioinputs (ITK concoction) and insecticides were superior over control in reducing the fruit fly damage and increasing yield. The application of spinosad 45 SC and chlorantraniliprole 18.5 SC gave maximum fruit yield (12,200 and 14,540 kg/ha) and (11,780 and 13,950 kg/ha) followed by agniastram (10,950 and 13,600 kg/ha), karpurakaraisal (10,570 and 13,095 kg/ha) in Kharif and Rabi, respectively. The minimum fruit yield was recorded in ten leaf extract (9560 and 11,110 kg/ha) during Kharif and Rabi. The benefit cost ratio was maximum in spinosad 45 SC (1:2.33 and 1:2.81) and chlorantraniliprole 18.5 SC (1:2.18 and 1:2.61) followed by agniastram (1:2.14 and 1:2.56), karpurakaraisal (1:2.20 and 1: 2.40) in Kharif and Rabi.
Background: Bitter gourd, an important tropical and sub-tropical vegetable which occupies a predominant position in Indian vegetables. The aphids and leafhoppers are more serious agricultural insect pests and aphids indirectly transmit plant virus diseases like, Cucumber Mosaic Virus (CMV) in cucurbit crops. Our study aimed to noticed seasonal fluctuations and bio-inputs using management of sucking pests in bitter gourd.Methods: Field experiments were conducted during 2017-19 in a farmer’s field at Ellamanam village, Tiruchirappalli district, Tamil Nadu in insect pest population was monitored at weekly intervals from ten randomly selected plants in three plots. In field efficacy studies conducted Randomised Block Design with eight treatments and three replications. Result: Our results showed in the maximum aphid and leafhopper populations were recorded in September 2018 during 39th SMW (Standard Meteorological Week). In Rabi, the aphids and leaf hopper population were maximum in 9th and 10th SMW in February and March. The population of aphids and leafhopper were positively correlated with maximum temperature, minimum temperature, wind speed and wind direction. Rainfall and relative humidity were negatively associated to aphids and leafhopper infestation. In Kharif and Rabi, high reduction of aphid and leafhopper pest population were noticed in chlorantraniliprole 18.5 SC and spinosad 45 SC compared to control. Among the bio-inputs agniastram recorded higher reduction of pest population followed by karpurakaraisal, NSKE, fish acid and ten leaf extract.
Aim: Study was carried out to record the abundance and diversity of insects in jasmine (Jasminum sambac L.) ecosystem. Methodology: To determine insect pests, natural enemies and non-insect diversity, fortnight observations were taken from second fortnight of September'19 to March'20 on insect population at three adjacent locations. Abundance and diversity indices were computed using mean data. The management practices, presence of weeds and adjacent cropping systems were also recorded at three locations to determine the reasons for variation in the diversity of organisms. Results: A total of 3335 individuals arthropods belonging to 55 species, which included 32 species of herbivores and 23 species of natural enemies were recorded throughout the study period. Location 3 had perennial crops in the vicinity, un-weeded ecosystem with no chemical inputs. Among various diversity indices calculated, Margalef Richness Index of herbivores was higher at location 3 (1.67) than location 1 (1.17) and 2 (0.76). Interpretation: The abundance and diversity of insects in different jasmine ecosystem depends on the chemical inputs and adjacent cropping system.
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