140 research outputs found
Host Selection Behavior of Helicoverpa armigera Summary Proceedings of the First Consultative Group Meeting 5-7 Mar 1990
Helicoverpa (Heliothis) armigera Hubner (Lepidoptera:
Noctuidae) is a major pest of several food
and cash crops in the Old Wor ld semi-arid tropics.
In this publication, scientists review research on
the host selection behavior of H. armigera and on
the mechanisms of host-plant resistance to this pest
in pigeonpea (Cajanus cajan (L.) Millsp.) and
chickpea (Cicer arietinum L.). Five technical papers
cover host selection by lepidopteran insects,
behavioral and electrophysiological studies of H.
armigera, the identification of host-plant resistance
in pigeonpea and chickpea, and the chemical
basis of pest resistance in these pulse crops.
Recommendations are made for further action to
control H. armigera through a better understanding
of its host selection behavior and the factors
that interfere wi th this behavior
Agroecology Now!
This open access book develops a framework for advancing agroecology transformations focusing on power, politics and governance. It explores the potential of agroecology as a sustainable and socially just alternative to todayâs dominant food regime. Agroecology is an ecological approach to farming that addresses climate change and biodiversity loss while contributing to the Sustainable Development Goals. Agroecology transformations represent a challenge to the power of corporations in controlling food system and a rejection of the industrial food systems that are at the root of many social and ecological ills. In this book the authors analyse the conditions that enable and disable agroecologyâs potential and present six âdomains of transformationâ where it comes into conflict with the dominant food system. They argue that food sovereignty, community-self organization and a shift to bottom-up governance are critical for the transformation to a socially just and ecologically viable food system. This book will be a valuable resource to researchers, students, policy makers and professionals across multidisciplinary areas including in the fields of food politics, international development, sustainability and resilience
The influence of rainfall deficits on the abundance of Helicoverpa (=Heliothis) armigera in Andhra Pradesh, India
Analysis of larval counts, light-trap data and weather patterns over a six year period shows that prolonged rainfall deficits promote the growth of Helicoverpa armigera populations in Andhra Pradesh, India. Drought stress resulting from rainfall shortages enhances the chemical cues involved in larval host selection behaviour and improves the nutritional quality of many wild and cultivated host plants on which this polyphagous pest reproduces. A more holistic analysis of the causes of H. armigera outbreaks should also include the effects of man induced drought that stem from the destabilisation of the water cycle in the drylands of India. Water conservation measures may need to be integrated in an overall plan of insect control on an area-wide basis
Spatial and temporal changes in the abundance of Helicoverpa (= Heliothis) armigera (Hubner) in India
A pheromone trap network was used to study the temporal and spatial variations in the abundance of the pod borer, Helicoverpa (= Heliothis) armigera (Hubner) in India. The pattern of pheromone trap catches of Helicoverpa armigera was similar within any given agroclimatic zone but there were also obvious changes with latitude in patterns of trap catches. The catches were generally higher and had more sharply defined peaks, at northern locations than at southern locations. The catches at the eastern locations were lower than those elsewhere. The practical applications of this information for pest control are discusse
Mulching Effects on Termite Scarification of Drying Groundnut Pods
Termites are important pests of groundnut in Africa
and Asia. Plant mortality and /or reduced yields
result(s) from tunneling in tap roots and stems,
defoliation, attack of pegs, scarification of podsâwith
associated increases in aflatoxin contamination; (see
cover photo), and consumption of drying haulm
Monitoring Adult Populations of Maruca testulalis (Geyer) with Light Traps at Patancheru and Hisarin India
Maruca testulalis (Geyer) is the most damaging insect pest of pigeonpea in some areas of Asia and Africa. The larvae of this insect web the leaves and terminal buds together, and feed and pupate inside this web. Attacks by this insect can last up to the podding stage
Effects of Mulches on Foraging Behaviour of Microtermes Obesi and Odontotermes Spp. in India
Termites are important agricultural pests in the semi-arid tropics. Conventional methods of control have relied on persistent organochloride insecticides with accompanying health and environmental problems. In contrast, cultural control methods provide untested, but environmentally sound options to farmers. This study reports results from three experiments on the use of mulches to reduce Microtermes obesi and Odontotermes spp. damage with relevance to groundnut production in India....
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