scholarly journals Thiamethoxam seed coating on rape seed for the control of cabbage aphid Brevicoryne brassicae (L)

2001 ◽  
Vol 54 ◽  
pp. 240-243
Author(s):  
N.C. Schroeder ◽  
A.J. Dumbleton
Keyword(s):  
Brassica Napus ◽  
Field Experiment ◽  
Seed Treatment ◽  
Brevicoryne Brassicae ◽  
Seed Coating ◽  
Rape Seed ◽  
Untreated Seed ◽  
Cabbage Aphid ◽  
Reproductive Rates ◽  
Over Time

A glasshouse and a field experiment were conducted to determine the efficacy of thiamethoxam as a seed treatment on forage brassica for the control of aphids Cabbage aphid (Brevicoryne brassicae L) survival and reproductive rates were measured from rape plants (Brassica napus spp biennis cv Emerald) grown in both experiments The seed was treated with four different thiamethoxam rates (1 2 4 and 8 g ai/kg) and compared to the registered rate of imidacloprid (144 g ai/kg) and untreated seed over time Six weeks after sowing only thiamethoxam at 8 g ai/kg and imidacloprid at 144 g ai/kg had significantly lower (P

scholarly journals Susceptibility of Myzus persicae, Brevicoryne brassicae and Nasonovia ribisnigri to Fungal Biopesticides in Laboratory and Field Experiments

Insects ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 55
Author(s):  
Gill Prince ◽  
Dave Chandler
Keyword(s):  
Field Experiment ◽  
Myzus Persicae ◽  
Field Experiments ◽  
Brevicoryne Brassicae ◽  
Vegetable Crops ◽  
Potato Aphid ◽  
Cabbage Aphid ◽  
Nasonovia Ribisnigri ◽  
Fungal Biopesticides ◽  
Peach Potato Aphid

The aim of this study was to evaluate the potential of entomopathogenic fungi (EPF) for the control of aphid pests of field vegetable crops. Four biopesticides based on the EPF Beauveria bassiana (Botanigard ES and Naturalis L), Cordyceps fumosorosea s.l. (Preferal WG), and Akanthomyces dipterigenus (Vertalec) were evaluated in a laboratory bioassay against peach-potato aphid Myzus persicae, cabbage aphid Brevicoryne brassicae, and currant-lettuce aphid Nasonovia ribisnigri. There was significant variation in the spore dose provided by the products, with Botanigard ES producing the highest dose (639 viable spores per mm2). Botanigard ES also caused more mortality than the other products. Combining Vertalec with the vegetable oil-based adjuvant Addit had an additive effect on the mortality of B. brassicae. All fungal products reduced the number of progeny produced by M. persicae but there was no effect with B. brassicae or N. ribisnigri. When aphid nymphs were treated with Botanigard ES and Preferal WG, both products reduced population development, with up to 86% reduction occurring for Botanigard ES against M. persicae. In a field experiment, Botanigard ES sprayed twice, at seven-day intervals, against B. brassicae on cabbage plants, reduced aphid numbers by 73%. In a second field experiment with B. brassicae, M. persicae, and N. ribisnigri, Botanigard ES reduced populations of B. brassicae and N. ribisnigri but there was no significant effect on M. persicae.

scholarly journals Studies on Inducer Mediated Resistance Responses against Biological Fitness of Brevicoryne brassicae (Homoptera: Aphididae) on Brassica napus

2020 ◽  
Vol 25 (01) ◽  
pp. 81-88
Author(s):  
Muhammad Wajid Javed
Keyword(s):  
Salicylic Acid ◽  
Brassica Napus ◽  
Insect Pests ◽  
Brevicoryne Brassicae ◽  
Dependent Manner ◽  
Progeny Production ◽  
Concentration Dependent Manner ◽  
Cabbage Aphid ◽  
Brassica Spp ◽  
Percent Mortality

Cabbage aphid, Brevicoryne brassicae is among the notorious insect pests of Canola (Brassica napus) and other Brassica spp., with a reported loss of up to 75%. It has gained resistance against conventional chemical insecticides. So, to activate inducer mediated plant resistance is among the workable solutions against this pest. Henceforth, inducer-mediated resistance based on categorizes of induced-resistance (IR), nutrient-deterrence (ND) and sulphur-integration (SI), was applied in 18 treatments. Their responses against aphid development period, reproduction time, progeny production, immature becoming adults, percent survival and mortalities, were noted-down. In the IR category, all the biological parameters were affected significantly by 1 mM (1 and mM should be in the same line) mM salicylic acid-T4 treatment, whereas in ND, silicon 50 kg ha-1-T10 was more effective. Likewise, during SI studies, bio-sulphur-T15 remained an efficient one. Overall, the developmental period of B. brassicae nymphs was delayed by T10 (Si 50 kg ha-1), followed by T4 (1 mM SA), while Compost-T16 expedited their development. Besides these, reproduction time was reduced at the most by T4, followed by T15. Aphid progeny production was again decreased significantly by T4 and T10, while T16 (Compost) presented the maximum progenies. Associatively, the least number of nymphs becoming adults were shown in T4, T10 followed by T7 (1 mM CA). The highest percent nymph survival was shown in T1 (control) and T16 (compost) with the highest nymph percent mortality in T4 and T7. Hence, salicylic acid, silicon, and bio-sulphur showed maximum effective resistance responses but in concentration-dependent manner. These findings can be used in future integrated pest management programs of aphids and other specialists on related hosts. © 2021 Friends Science Publishers

scholarly journals Testing of bio-rational and synthetic pesticides to manage cabbage aphid (Brevicoryne brassicae L.) in cabbage field at Rampur, Chitwan, Nepal

2021 ◽  
Vol 4 (2) ◽  
pp. 29-39
Author(s):  
Sushil Nyaupane ◽  
Sundar Tiwari ◽  
Resham Bahadur Thapa ◽  
Sita Jaishi
Keyword(s):  
Field Experiment ◽  
Natural Enemies ◽  
Block Design ◽  
Winter Season ◽  
Brevicoryne Brassicae ◽  
Chemical Insecticide ◽  
Cabbage Aphid ◽  
Important Pest ◽  
And Control ◽  
Treated Plot

Cabbage aphid (Brevicoryne brassicae L.) is an important pest of cabbage which reduces the yield and quality of the cabbage head. Farmers haven been using chemical pesticides to manage them but unfortunately these practices are toxic for human health, biodiversity and the environment. The study was conducted to test the efficacy of different bio-rational insecticides along with the chemical insecticide. ‘Green Coronet’ cabbage variety was used and the field experiment was laid out in the experimental farm of Agriculture and Forestry University (AFU), Rampur, Chitwan during the winter season of 2014.  The Experiment was designed in randomized complete block design with having 7 treatments (bio-rational insecticides with chemical and control)  and 3 replications. Plot size was 5.76 m2 (2.4m×2.4m) and spacing of 1 m was maintained between each blocks and plots. Field experiment showed that the highest reduction of cabbage aphid was obtained in Dimethoate (30 EC) treated plot followed by Derisom treated plot. The highest yield of cabbage head was obtained in Dimethoate treated plots (66.47 mt/ha) which was significantly at par with the Derisom (58.79 mt/ ha) treated plots. The yield for other treated plots were 47.60 mt/ha for Margosom, 43.77 mt/ha for Verticillium, 41.63 mt/ ha for Cow urine, 36.77 mt/ ha for Spinosad and control (33.45 mt/ ha) in terms of cabbage head yield. And, at the same time, natural enemies’ population was significantly lower to Dimethoate treated plots compared to bio-rational insecticides. Thus, Derisom (Derris based botanical) might be the best viable alternative in eco-friendly management of cabbage aphid considering cabbage head yield and protection of natural enemies. It was also evident from the research that Margosom (Neem based botanical) was found beneficial not only to conserve natural enemies in the cabbage field but also to minimize cabbage aphid population.

scholarly journals Simulation of the production pattern of rape-seed on the basis of a field experiment.

1984 ◽  
Vol 32 (3) ◽  
pp. 247-250
Author(s):  
M. Backx ◽  
J. van Duivenvoorden ◽  
J. Goudriaan
Keyword(s):  
Brassica Napus ◽  
Field Experiment ◽  
Simulation Model ◽  
Seed Yield ◽  
Growth And Development ◽  
Field Measurements ◽  
Light Interception ◽  
Rape Seed ◽  
Production Pattern

A simulation model, an extension of SUCROS, for growth and development of rape (Brassica napus) seed on the basis of laboratory and field measurements gave a final seed yield of 2.9 t/ha. Light interception by the inflorescence caused a reduction of 4, 8 and 5% in total DM yield, stem wt. and seed wt., resp. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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