Aphis Gossypii Pdf
However, research to date has not conclusively identified the relative importance of nutrition versus crowding in alate formation in A. Greater trichome density resulted in fewer aphids and less virus disease in ashgourd, Benincasa hispida Khan et al. The biggest ecosystem level threat might be its ability to transmit plant viruses.
For this reason, the role of salivary gland enzymes in detoxification has been examined as a possible defence. Although altered plant physiology may account for A.
Pirimicarb resistance in the melon and cotton aphid, Aphis gossypii Glover. In field trials in the Central African Republic, yield losses due to A. Non-specific predators with good searching ability that are active early in the year, such as Carabidae and Staphylinidae, are important when aphid numbers are low.
Occurrence and succession of pests of brinjal, Solanum melongena Linn. Relationship between host preference and organophosphorus resistance. Symptoms Top of page The initial symptom of A. Cotton insect pest management on small scale farms in Zambia I.
Neozygites fresenii in Aphis gossypii on cotton. While these traits might qualify this insect as an invasive threat, it has already colonized most parts of the world. Different host plants can play a direct role in detoxification of the insecticide Owusu et al. Effectiveness of syrphid flies in greenhouses.
Association between biochemical markers and insecticide resistance in the cotton aphid, Aphis gossypii Glover. The relationship between infestation, nitrogen application and cotton yield was investigated in a study in the Philippines. Life stage is another factor affecting the susceptibility of A. Developmental rates and fecundity of apterous Aphis gossypii on seedlings of Gossypium hirsutum.
Dynamics of insect pests and predatory enemy communities in cotton fields in north of the Huaihe River, Anhui Province. The evolution of aphid life cycles. Population Growth Reproductive rates in A. The more nitrogen applied, the greater was the infestation by A. Generate a print friendly version containing only the sections you need.
The simultaneous effect of early using of insecticides on cotton pests and its related natural enemies. Secondary host crops are ones where the aphid is not a global problem, or where it either does not cause much direct damage or is not a vector.
An annotated list of Aphididae Homoptera of North America. Study on induced resistance of cotton to Aphis gossypii with Pseudomonas gladioli. Insect pest succession in okra. Physiology of systemic insecticide - induced susceptibility of bhendi plants to Aphis gossypii G and Amrasca devastans.
Observations on the presence of some aphid species in tobacco areas of Campania and Veneto. Several members of the Aphidiinae and Aphelinidae wasp families are parasitoids of aphids. The distribution in this summary table is based on all the information available. However, it should be treated as a single exceptionally variable species, until meaningful and standardized quantification of the diversity within the species can be undertaken. Studies of Allothrombium pulvinum Zhang et al.
Invasive Species Compendium
Homoptera from Orissa, India. Temperature is also thought to be responsible for some strains of A. At very high densities, A. As aphids become more numerous, leaves become puckered, and curled. Studies on the host biotypes and its cause of cotton aphid in Nanjing, China.
Olfactory orientation of certain phytophagous insects in Cuba. It is a pest in very cold climates on crops grown in greenhouses. Field evaluation and economics of insecticides against the major pests of okra.
There was cross resistance to fenvalerate in aphids exposed to imidacloprid, but aphids exposed to fenvalerate did not show a cross resistance to imidacloprid. Comparisons of control action thresholds for Heliothis armigera, Bemisia tabaci and Aphis gossypii on cotton in the Sudan Gezira and Rahad regions. Effect of wind-induced mechanical stress on soluble peroxidase activity and resistance to pests in cucumber. Study on methods for controlling aphis in commercial lucerne production. It is not known where this species originated, but it is now found in tropical and temperate regions throughout the world except extreme northern areas.
Principles of crowding effect in Aphis gossypii Glover Aphididae, Homoptera. From Wikipedia, the free encyclopedia. Functional response of Lysiphlebus testaceipes Cresson Hymenoptera Braconidae against Aphis gossypii Glover Homoptera Aphididae at two constant temperatures. Adults flew from about sunrise to early afternoon, but a few individuals continued to fly after dark. Sri Lankan passion fruit mottle virus, a potyvirus infecting golden passion fruit in Sri Lanka.
It is a major pest of cotton and cucurbits. The dorsal abdominal segments are uniformly sclerotized and unpigmented. However, intercropping poses a problem when the minor crop harbours a disease of the primary crop. Notes on Natural Enemies Top of page Few aphid natural enemies are host specific, rather they are attracted to aphids in particular habitats.
Insecticide resistance in cotton aphid Aphis gossypii Glov. Integrated pest management studies of the cotton aphid, bonsai alejandro zambra pdf descargar Aphis gossypii Glover. Trials on the control of Aphis gossypii Glover with Coccinella axyridis Pallas.
Aphididae infesting cucumber. In China, it was shown that A.
The distribution over the cultures and seasonal dynamics of the sweetpotato whitefly Bemisia tabaci Genn. This treatment was applied to adults and nymphs on cotton for hour periods each day.
Thus, the important natural enemies attacking particular aphid pests on crops tend to vary according to the crop, the circumstances in which it is grown and the climate. Field biology studies of the cotton aphid, Aphis gossypii Glover. Wall reported that green morphs produce more alate offspring than do yellow morphs.
On the intermediate forms of Aphis gossypii Glover. Seasonal variation in the windborne movement of insect pests over northeast India. Using a damage index, a rating of for seedling cotton with fewer than three leaves, and a rating of for larger plants was recommended for treating cotton in China Zhang et al.
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