scholarly journals Evidences for newer insecticides and growth regulators resistance in field populations of Helicoverpa armigera (Lepidoptera: Noctuidae) in Karnataka, India

2022 ◽  
Author(s):  
Honnakerappa S Ballari ◽  
Shashikant Shiddappa Udikeri ◽  
Vinay Kalia
Keyword(s):  
Insecticide Resistance ◽  
Growth Regulators ◽  
Significant Positive Correlation ◽  
Insect Growth Regulator ◽  
Morphometric Parameters ◽  
Usage Pattern ◽  
Positive Relation ◽  
Resistance Level ◽  
Larval Length ◽  
Lepidoptera Noctuidae

The prominence of Helicoverpaarmigera (Lepidoptera: Noctuidae) averse insecticide resistance was traversed in the course of 2017 in Karnataka, India. The results divulged typical resistance level prostrating in selected newer insecticides, even though exiguous higher resistance airing in insect growth regulator Novaluranwith LC 50 of and 13.02 to 18.07 ppm and 1.17 to 1.95 folds resistance) compared to newer group insecticides Spinasad, Indoxacarb, Flubendiamide, and Rynaxypyr (3.57 to 10.19 ppm, 1.01 to 1.27 fold). Raichur and Kalaburgi strains comprehend higher resistance to Novaluran and newer insecticides with exception of Flubendiamide (Raichur and Vijayapura strains), respectively, and Spinosad (Kalaburgi and Raichur strains), respectively. The morphometric parameters of larval length, pupal length, and weight were most in RCH stain (2.75 cm, 1.76.18 cm, and 0.511 g, 0.309 g) respectively, which was pursued by Kalaburgi strain. The morphometric correlation revealed that larval length was a significant positive relation with insecticide resistance which might be an influence of resistance but not merely responsible. Among newer insecticides, a significant positive correlation between Rynaxypyr and Indoxacarb was evident, similarly, Nuvaluran with Indoxacarb and Rynaxypyr as well. Usage pattern revealed that 81.67 % of farmers found to use insecticides more than the recommended dose and 70.83% have habit consecutive applications of products from the same chemical group which bears witness to developing resistance.

Modelling pesticide residues on greasy wool: surveys of the insect growth regulators triflumuron and diflubenzuron

1999 ◽  
Vol 39 (5) ◽  
pp. 529 ◽  
Author(s):  
P. W. Morcombe ◽  
M. Gillibrand ◽  
B. J. Horton ◽  
R. T. F. Armstrong ◽  
N. J. Campbell ◽  
...  
Keyword(s):  
Growth Regulators ◽  
Insect Growth Regulator ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Industry Standards ◽  
Breakdown Rates ◽  
Average Residue ◽  
Farm Survey ◽  
On Farm ◽  
The Relationship

Surveys have examined the relationship between louse and flystrike treatments on farms and the resulting residues of insect growth regulators on greasy wool. These results have been summarised using a model of the on-farm survey data. The model estimated the amount of chemical taken up by the wool at application. This was based on experimental breakdown rates of these insecticides on wool determined in controlled trials. The data indicated that the backliner, triflumuron, when used off-shears within 24 h of shearing, was normally applied at slightly higher than the recommended rate on-farm and left an average residue of 30 mg/kg greasy wool at the following shearing 12 months later. Diflubenzuron, applied by dipping or jetting, was usually applied at lower than the recommended rates, and left an average residue of 40 mg/kg on the wool at shearing 12 months later. When treatment was applied to very short wool (<3 weeks after shearing) the residue was only about 20 mg/kg, but when applied at later times after shearing the residue at the following shearing was not closely related to the time of treatment. The model can be used to estimate the expected residue level and likely range of results from most standard insect growth regulator treatments. This will improve advice to producers so most can meet specified industry standards.

Evidence for a possible fitness trade-off between insecticide resistance and the low temperature movement that is essential for survival of UK populations of Myzus persicae (Hemiptera: Aphididae)

1997 ◽  
Vol 87 (6) ◽  
pp. 573-579 ◽  
Author(s):  
S. P. Foster ◽  
R. Harrington ◽  
A. L. Devonshire ◽  
I. Denholm ◽  
S. J. Clark ◽  
...  
Keyword(s):  
Low Temperature ◽  
Insecticide Resistance ◽  
Myzus Persicae ◽  
Low Temperatures ◽  
Leaf Fall ◽  
Extreme Resistance ◽  
Resistance Level ◽  
Trade Off ◽  
Maladaptive Behaviour ◽  
Esterase Production

AbstractApterous aphids need to move from ageing to younger leaves in order to survive UK winters. This behaviour was studied at low temperatures in field and laboratory trials using Myzus persicae (Sulzer) clones representing all five recognized categories of esterase-based insecticide resistance found in UK populations. Both studies showed that the tendency of aphids to move from deteriorating leaves was inversely related to their insecticide resistance level. This maladaptive behaviour associated with greater insecticide resistance could lead to increased risks of aphids becoming separated from plants after leaf fall, and subsequent death from starvation when adverse cold and wet conditions prevent return. Revertant clones, that had spontaneously lost extreme resistance to insecticides by ceasing to express their amplified esterase genes, tended to show similar behaviour to aphids that had retained their high resistance phenotypes. This implies that rates of movement were not related directly to esterase production.

Sign in / Sign up

Export Citation Format

Share Document