Efficacy of new molecules of insecticides against white fly Bemisia tabaci (Gennadius) and aphid Aphis craccivora (Koch) in Urdbean (Vigna mungo L.)

2017 ◽  
Vol 51 (05) ◽  
Author(s):  
Indrajeet Singh Rajawat ◽  
M. A. Alam ◽  
Akhilesh Kumar ◽  
R. K. Tiwari ◽  
Sachin Kumar Jaiswal
Keyword(s):  
Field Experiment ◽  
Bemisia Tabaci ◽  
Vigna Mungo ◽  
Aphis Craccivora ◽  
Emamectin Benzoate ◽  
Kharif Season ◽  
Aphis Craccivora Koch

Field experiment were carried out during Kharif season 2016-17 to evaluate the efficacy of Flubendiamide 24 % + Thiacloprid 24% SC 200 ml/ha, Flubendiamide 39.35% SC 125 ml/ha, Thiacloprid 21.7% SC 250 ml/ha, Chlorantraniliprole18.5% SC 160 ml/ha, Flubendiamide 24 % + Thiacloprid 24% SC 250 ml/ha, Quinalphos 25% EC 1500 ml/ha, Thiomethoxam 25% WG 125 g/ha and Emamectin benzoate 5% SG 220 g/ha against the Bemisia tabaci and Aphis craccivora. Thiacloprid 21.7% SC was found significantly most effective against white fly followed by Thiomethoxam 25% WG. While, Thiomethoxam 25% WG was found significantly most effective against aphid followed by Thiacloprid 21.7% SC whereas, Flubendiamide 39.35% SC was the least effective against both the pest.

scholarly journals Efficacy of newer insecticides against sucking pests of rice fallow blackgram (Vigna mungo L.)

2018 ◽  
Author(s):  
K. Swathi ◽  
P. Seetharamu ◽  
S. Dhurua ◽  
M. Suresh
Keyword(s):  
Field Experiment ◽  
Bemisia Tabaci ◽  
Untreated Control ◽  
Disease Incidence ◽  
Vigna Mungo ◽  
Experimental Results ◽  
Agricultural College ◽  
Untreated Check ◽  
Cent Disease ◽  
Thrips Population

A field experiment was conducted to determine the efficacy of different insecticides against sucking pests viz., thrips, Caliothrips indicus Bangall and whitefly Bemisia tabaci Gennadius, infesting blackgram in North coastal Andhrapradesh at Agricultural College, Naira during rabi 2017-2018.The experimental results revealed that all the treatments showed significant differences in reducing the population of sucking pests over untreated check. Among the tested insecticides, thiacloprid 21.7 SC @ 0.0325% was found to be highly effective against thrips by reducing74.80 per cent thrips population followed by acetamiprid 4 % + fipronil 4% @ 2ml l-1 with 70.81 per cent over untreated control, whereas flonicamid 50 WG @ 0.0325% was very effective against the population of whitefly byreducing 72.19 per cent and lowest per cent disease incidence (17.66%) followed by acetamiprid 4% + fipronil 4% @ 2ml l-1 (64.94%) and thiamethoxam 25 WG @ 0.005% (62.21%) which were on par with each other over control.

scholarly journals Characterization and Toxicity of Crude Toxins Produced by Cordyceps fumosorosea against Bemisia tabaci (Gennadius) and Aphis craccivora (Koch)

Toxins ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 220
Author(s):  
Jianhui Wu ◽  
Bo Yang ◽  
Jing Xu ◽  
Andrew G. S. Cuthbertson ◽  
Shaukat Ali
Keyword(s):  
Bemisia Tabaci ◽  
Pathogenic Fungus ◽  
Fourth Instar ◽  
Aphis Craccivora ◽  
Nuclear Magnetic Resonance Analysis ◽  
Resonance Analysis ◽  
Aphis Craccivora Koch ◽  
Median Lethal Concentrations ◽  
Chromatographic Peaks ◽  
Mass Spectrometery

Cordyceps fumosorosea, an insect pathogenic fungus, produces different toxins/secondary metabolites which can act as pest control agents. This study reports the extraction and characterization of crude mycelial extracts of C. fumosorosea isolate SP502 along with their bio-efficacy against Bemisia tabaci and Aphis craccivora. Fourier transform infrared spectroscopy, liquid chromatography, mass spectrometery and nuclear magnetic resonance analysis of C. fumosorosea isolate SP502 extracts showed the presence of five major compounds—Trichodermin, 5-Methylmellein, Brevianamide F, Enniatin and Beauvericin—which all may potentially be involved in insecticidal activity. The HPLC analysis of C. fumosorosea mycelial extracts and Beauvericin standard showed similar chromatographic peaks, with the content of Beauvericin in the crude toxin being calculated as 0.66 mg/ml. The median lethal concentrations of C. fumosorosea mycelial extracts towards first, second, third and fourth instar nymphs of A. craccivora were 46.35, 54.55, 68.94, and 81.92 µg/mL, respectively. The median lethal concentrations of C. fumosorosea mycelial extracts towards first, second, third and fourth instar nymphs of B. tabaci were 62.67, 72.84, 77.40, and 94.40 µg/mL, respectively. Our results demonstrate that bioactive compounds produced by C. fumosorosea isolate SP502 have insecticidal properties and could, therefore, be developed into biopesticides for the management of B. tabaci and A. craccivora.

Potency of Three Botanical Oils Against the Aphis Craccivora Koch (Homoptera: Aphididae) Nymphs Under Laboratory Conditions

2021 ◽  
Vol 19 (1) ◽  
pp. 139-154
Author(s):  
MA Hossain ◽  
MS Yasmin ◽  
MAA Bachchu ◽  
MA Alim
Keyword(s):  
Treatment Time ◽  
Probit Analysis ◽  
Aphis Craccivora ◽  
Tween 20 ◽  
Laboratory Conditions ◽  
Significant Difference ◽  
Aphis Craccivora Koch ◽  
Insect Mortality ◽  
Oil Repellent ◽  
Swietenia Mahagoni

Botanicals are promising and attractive alternatives for pest management. In the present study, three botanical oils namely neem (Azadirachta indica), karanja (Pongamia pinnata) and mehogony (Swietenia mahagoni) were tested against the nymphs of Aphis craccivora Koch to evaluate the toxic and repellent effects under laboratory conditions (25 ± 5oC, 65-75% RH). Four concentrations (0.5, 1.0, 1.5, and 2.0%) along with control were maintained with distilled water and tween-20 was used as emulsifier. Leaf dipped method were used for insect bioassay. Insect mortality was recorded at 24, 48 and 72 hours after intervals while repellency was carried out at 2 hours after intervals upto 10th hours and the collected data were analyzed through MSTAT-C program. Results indicated that all the tested oils had toxic and repellent effects against the A. craccivora nymphs. Among the tested botanical oils, no significant difference was observed in terms of mortality over treatment time. But significant difference was noticed over level of concentrations exerted by the botanical oils. The average highest mortality (28.62%) was recorded by the application of mehogony oil whereas neem oil showed the lowest mortality (27.21%) against the A. craccivora and the mortality was directly proportional to the level of concentrations and hour after treatment (HAT). Probit analysis showed the lowest LD50 values of mehogony oil which revealed the highest toxic effect against the nymph of bean aphid. The highest repellent effect (77.33%) was found in mehogony oil (repellent class IV) among all the botanical oils applied. On the contrary, neem (57.33%) and karanja (55.00%) oils belonged to the same repellent class that is repellent class II. Although all the tested botanical oils evaluated showed toxic and repellent effects but mehogony oil performed as the best potent oil against the nymphs. We therefore suggested using the mehogony oil for the management of bean aphid. SAARC J. Agric., 19(1): 139-154 (2021)

Effects of intersowing with beans on the spread of groundnut rosette virus by Aphis craccivora Koch (Hemiptera, Aphididae) in Malawi

1976 ◽  
Vol 66 (2) ◽  
pp. 331-333 ◽  
Author(s):  
J. A. K. Farrell
Keyword(s):  
Phaseolus Vulgaris ◽  
Arachis Hypogaea ◽  
Virus Disease ◽  
High Density ◽  
Aphis Craccivora ◽  
Plant Populations ◽  
Bean Plants ◽  
Aphis Craccivora Koch ◽  
Field Beans

AbstractIn two trials, at Chitedze, Malawi, in 1966–1967, the spread of rosette virus disease in groundnuts (Arachis hypogaea) intersown with field beans (Phaseolus vulgaris) was less than the spread in groundnut monocultures comprising plant populations equivalent to the number of groundnut plants and to the total number of plants in the intersown crop. In one trial, numbers of early rosette transmissions were related to numbers of alate Aphis craccivora Koch, the vector of the virus, found on groundnut plants. Immigrant alate A. craccivora settling on the intersown crop were trapped by the hooked epidermal hairs of the bean plants and the observed reduction of rosette infection in the intersown crop was attributed to this effect. Inter-sowing with beans is considered less effective than early-sown, high-density monoculture as a method of reducing groundnut rosette infections and yields of groundnuts from inter-sown crops may be lower than those obtained from high-density monoculture.

Optimizing the Application Time of Pre-emergence Herbicide Pendimethalin and Oxyfluorfen Application for Effective Weed Management in Irrigated Blackgram (Vigna mungo L.) and Its Residue Persistence

2021 ◽  
Author(s):  
S. Selvakumar ◽  
R. Ajaykumar ◽  
A. Ammaiyappan
Keyword(s):  
Field Experiment ◽  
Weed Control ◽  
Weed Management ◽  
Block Design ◽  
Vigna Mungo ◽  
Application Time ◽  
Herbicide Application ◽  
Control Efficiency ◽  
Randomized Block Design ◽  
Weed Control Efficiency

Background: Time of pre-emergence herbicide application is an important factor that decides the efficiency of herbicide. If the pre-emergence herbicide is not applied at appropriate time, it may cause ineffective weed control or toxicity to crops. With this background, a field experiment was conducted at TNAU, Madurai to optimize the time of pre-emergence herbicides namely pendimethalin and oxyfluorfen application for effective weed management in irrigated blackgram. Methods: The experiment was laid out in randomized block design with three replication. Treatments were application of pendimethalin at 0.75 kg ha-1 and oxyfluorfen at 0.2 kg ha-1 on 1, 2, 3, 4 days after sowing, weed free check and unweeded check. Result: Results of the study revealed that oxyfluorfen gave maximum weed control efficiency as compared to pendimethalin, but toxicity to the crop was observed when oxyfluorfen was sprayed after 2 days of sowing. Yield and economics were achieved higher with application of 0.75 kg ha-1 of pendimethalin at 2 DAS, which was on par with application of 0.2 kg ha-1 of oxyfluorfen at 1 DAS due to lesser toxicity. Application of 0.75 kg ha-1 of pendimethalin and 0.2 kg ha-1 of oxyfluorfen didn’t leave any herbicide residue after harvest. Hence, application of 0.75 kg ha-1 of pendimethalin at 2 DAS and 0.2 kg ha-1 of oxyfluorfen at 1 DAS can be recommended for effective weed management in irrigated balckgram.

Behavioural response of alate Aphis craccivora Koch (Homoptera: Aphididae) to volatiles from different cowpea cultivars

2019 ◽  
Vol 143 (6) ◽  
pp. 659-669
Author(s):  
Seydou Diabate ◽  
Emilie Deletre ◽  
Lucy Kananu Murungi ◽  
Komi K.M. Fiaboe ◽  
John Wesonga ◽  
...  
Keyword(s):  
Behavioural Response ◽  
Aphis Craccivora ◽  
Cowpea Cultivars ◽  
Aphis Craccivora Koch
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