摘要:

This paper presents further biological and ecological data on the Chrysopidae gathered during a study of the predators of the oriental fruit moth. The species concerned areChrysopa rufilabrisBurm.;C.plorabundaFitch;C.downesiR. C. Smith;C.oculataSay;C.nigricornisBurm.;Meleoma signorettiFitch andM.emunctaFitch. Data on life history include relation of development to temperature, number of generations, method of overwintering, and oviposition. The early stages ofC.downesi,M.signorettiandM.emunctaare described. Seasonal prevalence and fluctuations in abundance from year to year are discussed and notes are given on natural control agencies. The value of chrysopids in the biological control of the fruit moth is summarized, with the conclusion that only in exceptional seasons are they of appreciable importance.

ISSN:1923-4287    

DOI:10.1139/cjr37d-003

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The eggs of the trematode pass into water, embryonate and are swallowed by the snail,Goniobasis livescens. They do not hatch in water. In the snail, multiplication through redia and daughter redia stages takes place and cercariae, with long flanged tails and pigmented eyespots, are produced. These escape into the water, but have a free life of less than 48 hours. To survive during this period, they must penetrate the skin of a fish, a great variety of which are successful intermediaries. In the muscle of the fish, the cercaria encysts to become metacercaria, which is however not immediately infective. Infection of the definitive host is by ingestion of the uncooked fish.

ISSN:1923-4287    

DOI:10.1139/cjr37d-004

出版商:NRC Research Press    

年代:1937

数据来源: NRC