rohit kumar nayak | Sknau (original) (raw)

Papers by rohit kumar nayak

In an investigation carried out during Kharif 2018, bio-efficacy of nine insecticides and bio-pes... more In an investigation carried out during Kharif 2018, bio-efficacy of nine insecticides and bio-pesticides (including control) were tested against major sucking pest Leafhopper, Empoasca kerri Pruthi of groundnut at S.K.N. College of Agriculture, Jobner (Rajasthan). On the basis of mean per cent reduction in leafhopper population the treatment of imidacloprid 17.8SL (84.31%) was found most effective, followed by thiamethoxam 25WG (81.66%) and acetamiprid 20SP (80%) and were also statistically at par with each other in their efficacy. Bio-pesticides Metarhizium anisopliae 1.15 WP (33.56%) and NSKE (Neem Seed Kernel Extract) (49.68%) were proved least effective, however both were differed significantly with each other. The descending order of effectiveness of treatments were as imidacloprid > thiamethoxam > acetamiprid > methyl demeton > fipronil > acephate > NSKE > Metarhizium anisopliae. The highest pod yield was obtained from the plot treated with insecticide imi...

Egyptian Journal of Biological Pest Control

Indian Journal of Horticulture

Bumble bees are the most efficient pollinators not only for the wild plants, but also for pollina... more Bumble bees are the most efficient pollinators not only for the wild plants, but also for pollination services, used in both outdoor and greenhouse horticulture and orchards. In this experiment the influence of the bumble bee Bombus haemorrhoidalis Smith (Hymenoptera: Apidae) was analyzed and compared to honeybee pollination, hand-pollination, open-pollination and control (crop without pollinators) kiwifruit (Actinidia deliciosa Chev., a buzz pollinated species) grown under insect proof nylon cages. Buzz pollination resulted in higher fruit set (79.43%), longer fruits (59.56 mm/fruits), higher fruit breadth (40.58 mm/fruit), heavier fruits (68.14 g/fruit), higher total fruit yield (8.14 kg/vine), higher healthy fruits (94.60%), higher seed number (560.13 seeds/fruit) and test weight (1.67 g/1000 seed) in kiwifruit and accounted an increase of 46.05, 41.53, 37.00, 180, 191.75, 107.33, 25.34 and 57.54 per cent, respectively over control. Only A-grade and B-grade fruits were yielded in bumble bee pollinated fruit vines. Chemical parameters viz. TSS, TSS/acidity ratio, total sugars, reducing sugars and non-reducing sugars of kiwifruits were also found effected with buzz pollination. In kiwifruit, buzz pollination was observed as better mode of pollination next to hand-pollination. Bumble bee (B. haemorrhoidalis) pollination proved superior over control (crop without pollinator), open/natural pollination and equally good (at par) to hand-pollination, with respect to all quantitative as well as qualitative parameters. The preliminary present studies indicate that bumble bee pollination is helpful to enhance the quality and quantity of kiwifruit and will definitely increase farmer’s income.

International Journal of Chemical Studies, 2020

The investigation was carried out in the department of plant pathology, SKN College of Agricultur... more The investigation was carried out in the department of plant pathology, SKN College of Agriculture, Jobner, Jaipur (Rajasthan) during Kharif, 2017 to evaluate the efficacy of indigenous materials against sclerotinia rot disease of brinjal under in vitro and in vivo conditions. The six indigenous materials i. e. neem oil, garlic extract, castor oil, cow urine, heeng powder and turmeric powder were tested by poisoned food technique against sclerotinia rot pathogen. Among six indigenous materials, extract of garlic was found most effective in inhibiting mycelial growth (69.71, 95.72 and 98.00%) of Sclerotinia sclerotiorum at 5, 10 and 15 per cent, respectively followed by neem oil (63.96, 89.64 and 92.00%) and cow-urine (59.20, 81.21 and 84.00%) over control. Heeng powder was found least effective in inhibiting mycelial growth of S. sclerotiorum over control. The study indicates that all the three concentrations (5, 10 and 15%) of garlic extract were effective in reducing the sclerotinia rot disease incidence.

Journal of Pharmacognosy and Phytochemistry, 2020

Bumblebees are efficient pollinator of various fruit and vegetable crops as compare to honeybees ... more Bumblebees are efficient pollinator of various fruit and vegetable crops as compare to honeybees under protected condition as well as open conditions. The cross pollination carried out by bumblebees known as myophilly. Bumblebees have tend to forage faster than honeybees, pollinate more flowers per bee, long tongue prefers flower with long corolla tube. At low temperature and low light intensities, the foraging activities of bumblebees are more efficient and cost-effective alternate to hand/manual pollination even. They are perfect pollinator of flowers of family Solanaceae because sonication is required for pollination. Now a days, the population of bumblebees is decreasing at global level due to indiscriminate use of pesticides, loss of natural habitats, mechanization in agriculture and climate changes. The conservation techniques like modification of landscape such as promoting wild flowers and creation of niches for their hibernation, survival and reproduction etc. which provide favorable conditions to increase the bumblebees abundance, foraging behavior and their efficiency. The scientists should attempts for evaluating the pollination efficiency of bumblebees to boost the production of vegetable and fruit crops.

Journal of Entomology and Zoology Studies, 2019

International Journal of Current Microbiology and Applied Sciences, 2019

Foraging behavior of bumble bees and honey bees with respect to foraging activity, foraging rate,... more Foraging behavior of bumble bees and honey bees with respect to foraging activity, foraging rate, foraging speed, loose pollen grains and abundance were studied by utilization of bumble bees (B. haemorrhoidalis) and European honey bees for the pollination of kiwifruit cv. Allison under caged condition at kiwifruit orchard of Dr. YS Parmar University of Horticulture & Forestry, Nauni, Solan (HP) during 2017. The results revealed that high activity of bumble bees in cage with one colony and cage with two colonies were recorded during 1600-1800hr whereas activity of honey bees was maximum during 1200-1400hr. Bumble bees visited more number of flowers per minute than honey bees, however, honey bees took more time for completing a single foraging trip and spent significantly more time per flower than bumble bee. Peak abundance of bumble bees was recorded at 1600-1800hr and it was between 1200-1400hr for honey bees. Pollination index showed that B. haemorrhoidalis scored higher than A. mellifera. B. haemorrhoidalis carried more number of loose pollen grains adhered to its body as compared to A. mellifera. Number was almost double than that carried by A. mellifera. The present study suggests that bumble bee foragers preferred to visit kiwifruit bloom during morning and evening time than mid-day with more activity, foraging rate and foraging speed during these hours of the day while honey bees preferred mid-day hours with more activity, foraging rate and foraging speed to visit kiwifruit bloom.

Indian Journal of Horticulture, 2019

Journal of entomology and zoology studies, 2020

The Bombus haemorrhoidalis queens were collected while foraging on Adhatoda vasica, Brassica junc... more The Bombus haemorrhoidalis queens were collected while foraging on Adhatoda vasica, Brassica juncea, Hypericum oblongifolium, Papaver rhoeas, Scutellaria linearis, Cydonia oblonga and Antirrhinum majus from February to April. The laboratory reared bumble bee (Bombus haemorrhoidalis Smith) queens established in the field was introduced in flowering (at 5- 10% flowering) bell pepper crop and used for pollination in polyhouse. The number of bumble bees visiting bell pepper flowers were maximum (6.83 bumble bees/m2/5min) during 1600-1800h, whereas, minimum (2.00 bumble bees) during 1200-1400h. The maximum foraging rate (6.17 flowers/min) of B. haemorrhoidalis was during
0800-1000h, whereas, minimum (3.40 flowers) during 1200-1400h. The bumble bees spent maximum time on a single flower (6.90 sec/flower) during 0800-1000h, whereas, minimum time (4.47 sec) during 1200-1400h.

Drafts by rohit kumar nayak

Biomolecules Reports, 2018

Apitherapy is a branch of alternative therapy that uses honey bee products, including honey, bees... more Apitherapy is a branch of alternative therapy that uses honey bee products, including honey, beeswax, pollen, propolis, royal jelly and bee venom. It’s used to treat illnesses and their symptoms as well as pain from acute and chronic injuries. Proponents of apitherapy make claims for its health benefits which remain unsupported by evidence-based medicine.