| spatial and temporal dynamics of aphids (hemiptera: aphididae) in the columbia basin and northeastern oregon. | aphid species, such as the potato aphid, macrosiphum euphorbiae thomas, and the green peach aphid, myzus persicae sulzer, are routinely considered the most important pests of potatoes. potato aphid, green peach aphid, and more recently, other aphids such as the bird cherry-oat aphid rhopalosiphum padi l. have been identified as vectors of multiple plant pathogenic viruses in potatoes. since 2006, an area-wide trapping network consisting of ∼60 sites was developed through collaboration between re ... | 2017 | 28510728 |
| the causes and processes of the mid-summer population crash of the potato aphids macrosiphum euphorbiae and myzus persicae (hemiptera: aphididae). | populations of many phloem-feeding aphid species in temperate regions increase exponentially in early summer and then 'disappear', usually over a time-scale of a few days, in july. to understand these dynamics, empirical investigation of the causes and modelling of the processes underlying population change are required. numbers of the aphids myzus persicae(sulzer) and macrosiphum euphorbiae (thomas), monitored over three years in commercial potato fields in the uk, increased to a maximum of 2-2 ... | 2003 | 14641981 |
| tobacco overexpressing β-ocimene induces direct and indirect responses against aphids in receiver tomato plants. | in the last decade plant-to-plant communication has received an increasing attention, particularly for the role of volatile organic compounds as possible elicitors of plant defense. the role of β-ocimene as an interspecific elicitor of plant defense has been recently assessed in multitrophic systems including different plant species (solanaceae, poaceae, legumes) and different pest species including chewer insects and phytophagous mites. both chewer insects and phytophagous mites are known to el ... | 2015 | 25462075 |
| early presence of an enolase in the oviposition injecta of the aphid parasitoid aphidius ervi analyzed with chitosan beads as artificial hosts. | maternal factors of female wasps that are injected into hosts with their eggs at oviposition play a major role in strategies used by insect parasitoids to overcome host immunity, and to regulate host physiology during early stages of parasitism. here, we attempted to precisely determine and compare the protein patterns injected by the endoparasitoid aphidius ervi into two different host systems. chitosan beads of aphid size designed as artificial and physiologically inert hosts were used as ovip ... | 2013 | 23201274 |
| larval competition between aphidius ervi and praon volucre (hymenoptera: braconidae: aphidiinae) in macrosiphum euphorbiae (hemiptera: aphididae). | interspecific competition between parasitoid larvae may influence the size, structure, and stability of the population, leading to a reduction in total parasitism and thus restricting the pest control. aphidius ervi (haliday) and praon volucre (haliday) are endoparasitoids that possess a wide host range and present considerable potential for the biological control of the aphid macrosiphum euphorbiae (thomas). the larval competition between a. ervi and p. volucre, and the possible intrinsic compe ... | 2010 | 22546445 |
| role of xylem consumption on osmoregulation in macrosiphum euphorbiae (thomas). | aphids are phloem feeders that occasionally ingest xylem sap. the duration of xylem consumption by macrosiphum euphorbiae (hemiptera: aphididae) was positively correlated with the level of dehydration of alate aphids of different ages after a period of starvation, supporting the hypothesis that aphids ingest xylem sap to replenish their water balance. however, the duration of xylem sap ingestion but not phloem sap consumption varied in unstarved alate adults of different ages. furthermore, both ... | 2010 | 20036244 |
| a proteomic analysis of the aphid macrosiphum euphorbiae under heat and radiation stress. | temperature and solar radiation can be important sources of abiotic stress for small herbivorous insects living in close association with plants. we examined the effects of daily fluctuations of heat and uv radiation on the proteome and performance of winged and wingless morphs of the aphid macrosiphum euphorbiae. a daily regime of 4h of heat stress at 35 degrees c had more negative effects on the aphid's fitness than a similar period of uv-b stress (11.6kjm(-2) per day), and these effects were ... | 2009 | 19000926 |
| wild solanum resistance to aphids: antixenosis or antibiosis? | the type (antixenosis or antibiosis) of resistance against the aphids myzus persicae (sulzer) and macrosiphum euphorbiae (thomas) was characterized for the wild tuber-bearing potatoes, solanum chomatophilum bitter and solanum stoloniferum schltdl. & bouché through behavioral (olfactometry and electrical penetration graph) and physiological studies. in dual-choice assays, only s. stoloniferum exerted attraction to m. euphorbiae. this ruled out the possibility that plant volatiles of s. chomatophi ... | 2008 | 18459428 |
| induced plant responses to multiple damagers: differential effects on an herbivore and its parasitoid. | herbivore-induced plants responses can affect the preference and performance of herbivores and their natural enemies. these responses may vary depending on the identity and number of herbivore species feeding on the plant so that when herbivores from different guilds feed on plants, the interactions between plants, herbivores, and natural enemies may be disrupted. tomato plants were damaged either by the caterpillar spodoptera exigua, or the aphid macrosiphum euphorbiae, or damaged by both herbi ... | 2005 | 15791425 |
| projection pursuit nonparametric regression applied to field counts of the aphid macrosiphum euphorbiae (homoptera: aphididae) on tomato crops in greenhouses. | the number of plants that sampling requires in aphid population studies often exceeds one hundred. thus, only quick and nondestructive methods can be used to sample this pest in a reasonable time interval. we propose a visual method for estimating the density of the aphid macrosiphum euphorbiae (thomas) on tomato plants reared in greenhouses. after approximately 1min of visual observation plants can be assigned to abundance classes, the boundaries of which are roughly the powers of square root 1 ... | 2002 | 12020032 |
| role of olfaction in host finding by aphid parasitoidaphidius nigripes (hymenoptera: aphidiidae). | the olfactory responses of the parasitoidaphidius nigripes ashmead were investigated with a four-field airflow olfactometer. female and male parasitoids did not respond to potato plants, the food plant of their host. however, females were strongly attracted by odors from a preferred host,macrosiphum euphorbiae (thomas), and also from less preferred hosts such asmyzus persicae (sulzer) andaphis nasturtii kalt. moreover,a. nigripes females responded positively to odors from a nonhost aphid,rhopalo ... | 1985 | 24310224 |
| juvenile hormone analogs: detrimental effects on the development of an endoparasitoid. | a high incidence of mortality of the endoparasitoid aphidius nigripes was observed when its host. macrosiphum euphorbiae, was treated with juvenile hormone analogs. larval and pupal stages of the parasitoid were susceptible. off-target effects on natural enemies may seriously limit the use of juvenile hormone analogs, especially in integrated control programs. | 1975 | 1162346 |
| evidence of multiplication of sowthistle yellow vein virus in an inefficient aphid vector, macrosiphum euphorbiae. | | 1973 | 4712389 |