| occurrence and transmission of facultative endosymbionts in aphids. | the occurrence of a secondary bacterial symbiont (pass) of pea aphid, acyrthosiphon pisum (harris), was detected by polymerase chain reaction (pcr) with specific nucleotide primers based on pass 16s rdna nucleotide sequences from over 80% (50/57) of clones of pea aphid collected from widely separated locations in california. pass was also detected by pcr in both red and green phenotypes of rose aphid,macrosiphum rosae (l.), but not in six other species of aphids examined, including blue alfalfa ... | 1997 | 9058541 |
| alternaria toxin-induced resistance in rose plants against rose aphid (macrosiphum rosivorum): effect of tenuazonic acid. | many different types of toxins are produced by the fungus, alternaria alternata (fr.) keissler. little is known, however, regarding the influence of these toxins on insects. in this study, we investigated the toxin-induced inhibitory effects of the toxin produced by a. alternata on the rose aphid, macrosiphum rosivorum, when the toxin was applied to leaves of the rose, rosa chinensis. the results demonstrated that the purified crude toxin was non-harmful to rose plants and rose aphids, but had a ... | 2015 | 25845360 |
| alternaria toxin-induced resistance against rose aphids and olfactory response of aphids to toxin-induced volatiles of rose plants. | the search for active toxins for managing weeds or plant diseases is believed to be a promising avenue of investigation. however, the effects of alternaria toxins on insects have just begun to be investigated. bioactivities of toxins from four strains of alternaria alternata on rosa chinensis and rose aphid macrosiphum rosivorum were tested in the present study. at a concentration of 50.0 μg/ml, the crude extract (toxin) of strain 7484 was found not to be harmful to rose plants with excised leaf ... | 2012 | 22302426 |
| secondary bacterial symbiont community in aphids responds to plant diversity. | biodiversity is important for ecosystem functioning and biotic interactions. in experimental grasslands, increasing plant species richness is known to increase the diversity of associated herbivores and their predators. if these interactions can also involve endosymbionts that reside within a plant or animal host is currently unknown. in plant-feeding aphids, secondary bacterial symbionts can have strong fitness effects on the host, e.g. resistance to natural enemies or fungal pathogens. we exam ... | 2016 | 26603858 |
| indirect effects of air pollutants: changes in plant/parasite interactions. | the impact of air pollutants on plant/parasite-interactions has been investigated. it could be demonstrated that fumigation of vicia faba l. with 0.15 ppm so2 (400 microg m(-3)) or 0.2 ppm no2 (400 microg m(-3)) during 7 days caused changes in plant metabolism which resulted in higher growth rates of the aphid aphis fabae scop. feeding on these plants. fumigation of v. faba with 0.085 ppm o3 during 2 or 3 days, however, caused decreased aphid growth on fumigated plants. that result could be reve ... | 1988 | 15092550 |
| host preference by allothrombium pulvinum (acari: trombidiidae) larvae on aphids: macrosiphum rosae, aphis gossypii and hyalopterus amygdali (homoptera: aphididae). | in this study aphid-plant association and its effect on host preference of parasitic allothrombium pulvinum larvae was examined with multiple-choice tests. host species selection, host size selection and superparasitism with mite larvae were studied with two-choice tests. three aphid species were used: macrosiphum rosae, aphis gossypii and hyalopterus amygdali. in multiple-choice tests, larvae of a. pulvinum showed no significant preference for any aphid-plant association when given m. rosae on ... | 2002 | 12797404 |
| plant cues for aphid navigation in vascular tissues. | the ability of aphids to detect and find sieve tubes suggests that aphids receive cues for sieve-tube recognition by taking samples. specific natural conditions such as ph value, sugar species and concentration, viscosity, and oxygen pressure may enable sieve-tube detection. we tested the preference of megoura viciae and myzus persicae for potential plant-borne orientation parameters in artificial choice-chamber systems. both species preferred sucrose (in comparison with fructose, glucose, raffi ... | 2010 | 21075945 |
| the fine structure of the mycetome symbiotes of the aphids brevicoryne brassicae, myzus persicae, and macrosiphum rosae. | | 1971 | 4999588 |
| aphid species affect foraging behavior of coccinella septempunctata (coccinellidae: coleoptera). | flowers are admirable in scenic good looks and artistic beautification. these are also playing necessary roles in therapeutic preparations. aphid is an important sucking pest of various flowers in ornamental territories and it is generally controlled by predators, so it was necessary to evaluate which aphid species affect the predator more or less. | 2017 | 29023008 |
| population growth parameters of rose aphid, macrosiphum rosae (hemiptera: aphididae) on different rose cultivars. | the rose aphid, macrosiphum rosae (l.), is one of the most important pests on rose plants (rosa spp.) with a worldwide distribution. as resistance indices, the development, survivorship, and reproduction of this aphid were evaluated on 10 rose cultivars, including bella vita, cool water, dolce vita, maroussia, orange juice, pinkpromise, roulette, tea, valentine, and persian yellow in laboratory at 25 ± 1°c, 65 ± 5% relative humidity, and photoperiod of 16:8 (l/d) h. rose aphid successfully survi ... | 2017 | 27553720 |
| role of host plant alternation in the precocity and intensity of parasitoid activity on of cereal aphids. | integrated pest management programs tend to reduce the chemical input by enhancing the development of biological control. cereal aphids cause important damages to winter wheat in europe but are currently under the pressure of several parasitoid species (braconidae: aphidiinae). previous ecological studies have reported the existence of an asynchrony between aphid and parasitoid populations in early spring in cereal cultures. here, we tested the presence of rose bushes (rosa rugosa) as a host pla ... | 2005 | 16628892 |
| evidence for a link between local and seasonal cycles in gene frequencies and latitudinal gene clines in a cyclic parthenogen. | in an earlier study (rhombergh et al., can. j. genet. cytol. 27: 224-232, 1985) of natural populations of the cyclic parthenogenetic rose aphids, macrosiphum rosae, 6 out of 31 loci were found to be polymorphic and one locus (esterase-4) showed cyclic seasonal changes in gene and genotypic frequencies. assuming that the est-4 polymorphism was balanced and due to some climatic factor that varies seasonally, and realizing that most environmental factors that vary seasonally also vary latitudinally ... | 2017 | 3248714 |
| the search for hidden enzymatic variation in the aphid macrosiphum rosae (l.). | using two different buffer systems and up to 6 different electrophoretic polyacrylamide gel concentrations, hidden enzymatic variability was investigated in samples of the rose aphid macrosiphum rosae. mdh1, pgm1, sdh, est and lap were found to be polymorphic. no additional variation was observed by changing the test conditions compared to those of earlier investigations using starch gel electrophoresis. | 1986 | 24240751 |
| [formation of cuticle during the embryonal development of the plant louse (macrosiphum rosae)]. | | 1965 | 5888420 |