Showing papers on "Aphididae published in 1968"

Difference in Flight Capacity between Naturally Occurring Spring and Summer Forms of Myzus persicae (Sulz.) (Hemiptera:Aphididae)

Abstract: ONE approach to the problem of the distances flown by aphids is to study the length of time they retain the ability to fly. In many species, flight capacity is restricted to the first few days of adult life, and this has important implications for the epidemiology of plant viruses and, in particular, viruses of the “persistent” type, such as potato leaf roll virus. Alate “alienicolae” of Myzus persicae, in common with several aphids of economic importance, lose the ability to fly about 3 days after the final moult, provided they settle down on a host plant, for settling is a prerequisite for the physiological processes leading to flight muscle autolysis1–3.

Laboratory Investigations of Flight Activity and Production of Alatae in the Corn Leaf Aphid, Rhopalosiphum maidis (Homoptera: Aphididae)

Abstract: In flight-chamber studies, alate corn leaf aphids, Rhopalosiphum maidis (Fitch), which had been allowed to fly for 2 hours, settled on host plants more readily than aphids which had not exercised, and they had a shorter interval between isolation on the host and production of offspring. Their mortality rate in isolation cages was lower than that of nonexercised alatae. Newly postteneral alates with amputated antennae were slower to fly from host plants when confronted with a light source than those with intact antennae, but this was true only if the amputated portion included the third segment, on which antennal sensoria are most numerous. Production of alates among apterous adult R. maidis was greatest under conditions of crowding and increased host age. Photoperiod and temperature had no apparent influence on production of alatae.

Neuquenaphis papillata, a new nothofagus-infesting aphid from chile, with a review of related species from south america (homoptera: aphididae)

Abstract: Neuquenaphis papillata is described from material collected on Nothofagus obliqua Blume in Chile. Its affinities with other known South American Nothofagus-infesting aphids are noted and a key to the known species of Neuquenaphis is given. In addition to papillata, species included in the review are: Neuquenaphis edwardsi (Laing), N. michelbacheri Essig, Spicaphis chilensis (Essig), and Spicaphis michelbacheri Essig.

Glyphina longiseta , a new alder-infesting aphid from nova scotia (homoptera: aphididae)

Abstract: Glyphina longiseta , a new alder-infesting aphid, is described from Nova Scotia and its affinities noted.

Calaphis manitobensis , a new aphid collected on betula pumila in manitoba (homoptera: aphididae)

Abstract: Calaphis manitobensis is described and illustrated. The only known host is swamp or low birch, Betula pumila L.