Comparative Biology and Reproductive Performances of Helicoverpa armigera (Hübner) Populations Across India

2020 ◽  
Author(s):  
Snehel Chakravarty ◽  
C.P. Srivastava ◽  
Ram Keval
Keyword(s):  
Helicoverpa Armigera ◽  
Grain Legumes ◽  
Adult Longevity ◽  
Pest Species ◽  
Demographic Traits ◽  
Helicoverpa Armígera ◽  
Survival And Reproduction ◽  
Geographic Populations ◽  
Helicoverpa Armigera Hubner

Background: Helicoverpa armigera (Hübner) is an important biotic constraint to major grain legumes in India. Biological characterization of any pest species is critical for making effective management decisions. Thus, this study comprehensively presents the biological and reproductive demographic traits of different geographic populations of H. armigera across the country. Methods: In this field-laboratory investigation (2015-18), populations from 20 localities were evaluated for developmental period of all the life stages, survival and reproduction and growth and fitness indices. All these parameters were recorded from the maintained insect cultures of each location from second filial (F2) generation.Result: The mean developmental periods of the immature stages, as well as adult longevity, were found to be longest in the Cooch Behar population. In contrast, the populations from South Zone took significantly shorter duration over others to complete their life cycle. All the populations were found to be female-biased, but significant differences were observed for reproductive competence of female moths. Wide variations were also observed in the relative growth and fitness indices, with the highest recorded from Varanasi population. Cluster analysis differentiated studied populations into two distinct groups. Such variations seem to be due to probable genetic heterogeneity in H. armigera populations of India.

Section 1. The Australian insecticide resistance management strategy

1993 ◽  
Vol 1 ◽  
pp. 1-4 ◽  
Author(s):  
Neil W. Forrester ◽  
Matthew Cahill ◽  
Lisa J. Bird ◽  
Jacquelyn K. Layland
Keyword(s):  
Insecticide Resistance ◽  
Helicoverpa Armigera ◽  
Pyrethroid Resistance ◽  
Resistance Management ◽  
Grain Legumes ◽  
Pest Species ◽  
Insecticide Resistance Management ◽  
Eastern Australia ◽  
Helicoverpa Armígera ◽  
Chemical Groups

SummaryIn response to field pyrethroid failures against Helicoverpa armigera (Hübner) in early 1983, an insecticide resistance management (IRM) strategy was introduced for insect control in summer crops in eastern Australia. The aims of this strategy were to contain the pyrethroid resistance problem, to prevent re-selection of historical endosulfan resistance (both curative IRM) and to avoid any future problems with organophosphate/carbamate resistance (preventative IRM). An alternation strategy was adopted which was based on the rotation of unrelated chemical groups on a per generation basis, along with a strong recommendation for the use of ovicidal mixtures. These chemical countermeasures were then integrated with other non-chemical control methods (biological and cultural) into a workable integrated pest management programme. The restrictions were applied to all Helicoverpa armigera susceptible crops (including cereals, oilseeds, grain legumes, tomatoes, tobacco and cotton) and even to other co-incident pest species. From its inception, compliance with the voluntary strategy has been exceptional.

scholarly journals Impact of the Stem Extract of Thevetia neriifolia on the Feeding Potential and Histological Architecture of the Midgut Epithelial Tissue of Early Fourth Instars of Helicoverpa armigera HÜbner

2015 ◽  
Vol 7 ◽  
pp. IJIS.S29127 ◽  
Author(s):  
Monika Mishra ◽  
Kamal Kumar Gupta ◽  
Sarita Kumar
Keyword(s):  
Helicoverpa Armigera ◽  
Negative Impact ◽  
Epithelial Tissue ◽  
Larval Feeding ◽  
Agricultural Crop ◽  
Pest Species ◽  
Helicoverpa Armígera ◽  
Stem Extract ◽  
Histological Architecture ◽  
Helicoverpa Armigera Hubner

Helicoverpa armigera HÜbner is one of the most important agricultural crop pests in the world causing heavy crop yield losses. The continued and indiscriminate use of synthetic insecticides in agriculture for their control has received wide public apprehension because of multifarious problems, including insecticide resistance, resurgence of pest species, environmental pollution, and toxic hazards to humans and nontarget organisms. These problems have necessitated the need to explore and develop alternative strategies using eco-friendly and biodegradable plant products. In view of this, the efficacy of Thevetia neriifolia methanol stem extract was evaluated against the early fourth instars of H. armigera as an antifeedant and stomach poison agent. Feeding of larvae with the diet containing 0.005%–5.0% extract resulted in 2.06%–37.35% antifeedant index; the diet with 5.0% extract caused 54.3% reduced consumption. The negative impact of extract on larval feeding resulted in 37.5%–77.7% starvation, causing adverse effects on the larval weight. Choice between control and experimental diet resulted in feeding preference of larvae for the control diet, leading to 7.3%–42.9% reduced consumption of extract-containing diet. The only exception was the diet with 0.005% extract, which could not cause any deterrence. The midgut histological architecture of H. armigera larvae fed with 0.005%–0.05% extract-containing diet with negligible antifeedant potential showed significant damage, shrinkage, and distortion and vacuolization of gut tissues and peritrophic membrane, causing the disintegration of epithelial, goblet, and regenerative cells; the damage increased with the increase in concentration. These changes in the gut caused negative impact on the digestion and absorption of food and thus nutritional deficiency in the larvae, which could probably affect their growth and development. This study reveal the appreciable stomach poison potential of T. neriifolia stem methanol extract against H. armigera larvae, which can be explored as an eco-friendly pest control strategy.

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