| aphid pests of strawberry crops and their parasitoids in france. | the pest status of aphids on strawberry crops has changed with time. they were mainly considered with respect to virus transmission. now, they are rather considered as sap-feeders and honeydew producers. as such, low populations regulated by natural enemies can be tolerated and systematic use of insecticides avoided. a survey of the species present in the different areas of production has been undertaken during 1999 and 2000 in france. during this survey, well known species of the strawberry cro ... | 2001 | 12425050 |
| strawberry crinkle virus, a cytorhabdovirus needing more attention from virologists. | summary taxonomic relationship: a member of nonsegmented, negative-sense, single-stranded rna viruses of the genus cytorhabdovirus (type member: lettuce necrotic yellows virus), family rhabdoviridae, order mononegavirales. members of the family rhabdoviridae can infect vertebrates, invertebrates and plants. physical properties: virions are bacilliform, 74-88 nm in diameter and 163-383 nm in length with surface projections probably composed of trimers of the glycoprotein g, occurring in the cytop ... | 2000 | 20572980 |
| antifeedant activity of extracts from neem,azadirachta indica, to strawberry aphid,chaetosiphon fragaefolii. | leaf disk choice test bioassays demonstrated that formulated neem seed oil (nso) was equally deterrent to first- and third-instar nymphs and adult strawberry aphids,chaetosiphon fragaefolii (cockerell). concentrations of nso resulting in 50% feeding deterrence were approximately 1.1% for this species. the rapid disruption of aphid feeding (<1 hr) was not related to the presence of the limonoid azadirachtin, and deterrence likely results from the combined activity of several compounds. activity t ... | 1993 | 24249239 |
| negative interaction between twospotted spider mites and aphids mediated by feeding damage and honeydew. | among the herbivorous arthropods that feed on strawberry, the most important are the two-spotted spider mite (tssm), tetranychus urticae koch, and several species of aphids. mites and aphids belong to different guilds that coexist in the field and feed on the undersides of strawberry leaflets. however, the occurrence of large numbers of individuals of both species on the same leaflet is rarely recorded. we hypothesize that negative interactions between tssm and aphids explain the intraplant dist ... | 2013 | 23043760 |
| aphid species and population dynamics associated with strawberry. | aphids are among the major pests associated with strawberries in southern brasil. in this study, we identified the main species that occur in strawberry fields in the states of paraná and rio grande do sul, brasil. we also compared the effectiveness of different sampling methods and studied the population dynamics of aphid species during two strawberry crop cycles in the municipality of pinhais, state of paraná, brasil. chaetosiphon fragaefolii (cockerell) and aphis forbesi weed were the main sp ... | 2013 | 27193281 |
| presence of the aphid, chaetosiphon fragaefolii, on strawberry in argentina. | seasonal abundance of the strawberry aphid complex under different agronomic practices in the outskirts of la plata, argentina was studied on strawberry, fragaria x ananassa duchesne (rosales: rosaceae). aphid densities were low in strawberry fields in which insecticides and fungicides were used. in addition to aphis gossypii, aphis fabae, mysus persicae and macrosiphum euphorbiae, the aphid, chaetosiphon fragaefolii (cockerell) (homoptera: aphididae), was recorded for the first time in this hor ... | 2010 | 20569141 |
| genetic structure of the aphid, chaetosiphon fragaefolii, and its role as a vector of the strawberry yellow edge virus to a native strawberry, fragaria chiloensis in chile. | the monoecious anholocyclical aphid, chaetosiphon fragaefolii (cockerell) (homoptera: aphididae), was collected on a native strawberry, fragaria chiloensis (l.) duchesne (rosales: rosaceae) from different sites in chile. the presence of this aphid was recorded during two consecutive years. f. chiloensis plants were collected from seven natural and cultivated growing areas in central and southern chile. aphids were genotyped by cross-species amplification of four microsatellite loci from other ap ... | 2012 | 23438175 |
| variation in and correlation between intrinsic rate of increase and carrying capacity. | intrinsic population growth rate and density dependence are fundamental components of population dynamics. theory suggests that variation in and correlations between these parameters among patches within a population can influence overall population size, but data on the degree of variation and correlation are rare. replicate populations of a specialist aphid (chaetosiphon fragaefolii) were followed on 11 genotypes of host plant (fragaria chiloensis) in the greenhouse. population models fit to t ... | 2007 | 17206592 |