摘要:

The potassium content of nectar loads from honey bees,Apis melliferaL., returning from foraging trips was used as an index of bee activity on onion,Allium cepaL. The percentage of nectar-gathering bees that had loads of onion nectar was highest for those colonies located beside the field and decreased with increased distance from the field. Onion nectar-collecting bees made up a larger percentage of nectar foragers during the 1 st week after the colonies were moved to the field than during subsequent weeks.

ISSN:1754-5692    

DOI:10.1093/ee/5.4.780

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

The seasonal response ofAnthonomus grandisBoheman to pheromone produced by males of the species and the synthetic pheromone (grandlure) was investigated in the Rolling Plains of Texas over a 6-yr period. Records were maintained on numbers of boll weevils captured on traps located at various distances from cotton fields. Weevil entry into grandlure-baited cotton was compared to weevil response to traps.The last major period of overwintered weevil response to the pheromone source during the spring and a subsequent decline in response occurred about the same time during most years independent of the pheromone location with respect to cotton. The similarity in weevil response trends indicated that the presence of pheromone producing ♂ weevils in cotton was not a major causal factor in the decline in weevil response to traps.These results contradict an earlier hypothesis stating that reduced response to traps during mid-season is initiated by competition from ♂ weevils inhabiting cotton in the trapping area.The present study concludes that the decline in weevil response to traps in the spring is a seasonally related phenomenon regulated by presently unknown factors but not by competition from pheromone-producing weevils in cotton.

ISSN:1754-5692    

DOI:10.1093/ee/5.4.783

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

A comparison was made of the effectiveness of malaise trapping and aerial netting for sampling a community of 50 species of Tabanidae collected near Deer Lake, Boonton, NJ during 1974. Five sites in the study area were sampled by malaise traps and by netting about the head with an insect net. Comparisons were made of 4 community and 4 population parameters. No significant difference existed between the species richness of the community of flies sampled by each method, but malaise traps sampled the tabanid community with greater diversity and evenness than did netting. The species composition of the community trapped by each method differed substantially.HybomitraandTabanuswere sampled in significantly greater numbers by malaise traps while netting favored the dominantChrysopsspecies. Seasonal niche breadths, seasonal ranges and seasonal distributions were measured concordantly by each sampling method. Neither trapping method should be used alone in studies concerning the entire tabanid community, but can be used effectively together.

ISSN:1754-5692    

DOI:10.1093/ee/5.4.788

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

An aerial application of carbaryl (Sevin-4-oil)®at rate of one lb AI/acre was studied for effects on mites, Collembola, andCalosomabeetles in an oak forest type. Pre- and post-spray populations were compared, and except for mites a short term reduction resulted, but population densities appeared normal by the following spring.

ISSN:1754-5692    

DOI:10.1093/ee/5.4.793

出版商:Oxford University Press    

年代:1976

数据来源: OUP