Zobrazeno 1 - 5
of 5
pro vyhledávání: '"D. S. Ruth"'
Autor:
A. F. Hedlin, D. S. Ruth
Publikováno v:
Canadian Journal of Forest Research. 4:441-445
Larvae of the chalcid Megastigmusspermotrophus in Douglas-fir seeds were killed when treated at 45 °C for 27 h (2-year-old seed) and for 33 h (1-year-old seed). Heat treatment of uninfested seed did not affect rate of germination of seedling growth.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3048c784a2239e0a907ef45f3b3fca4
https://doi.org/10.1139/x74-065
https://doi.org/10.1139/x74-065
Publikováno v:
The Canadian Entomologist. 114:1179-1183
Pharate adult (adult within the pupal cuticle) diapause was discovered in Barbara colfaxiana (Kft.) and is reported. This phenomenon is uncommon in insect development. It was also shown that both the termination of diapause and the subsequent advance
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3356b4b1ce43dfcec248445827196185
https://doi.org/10.4039/ent1141179-12
https://doi.org/10.4039/ent1141179-12
Publikováno v:
The Canadian Entomologist. 114:465-471
Studies were carried out in the field and in the laboratory to determine if prolonged diapause of the Douglas-fir cone moth, Barbara coifaxiana (Kearfott), was correlated with the sizes of the cone crops maturing in the year of larval feeding (N) and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::161d9076f84084b33a88949b33dbe60f
https://doi.org/10.4039/ent114465-6
https://doi.org/10.4039/ent114465-6
Autor:
A. F. Hedlin, D. S. Ruth
Publikováno v:
The Canadian Entomologist. 102:105-108
Pityophthorus orarius Bright is a small beetle which mines and kills shoots of Douglas-fir. The adult tunnels into the shoot in early summer and lays its eggs. Tunnelling of the larvae causes twig mortality indicated by characteristic "flagging".
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a83f06847e107069c10302222f6da4b
https://doi.org/10.4039/ent102105-1
https://doi.org/10.4039/ent102105-1
Publikováno v:
Experientia. 33:723-725
Field studies have shown that mixtures of trans-7-dodecen-1-ol and up to 10% of the cis isomer are effective attractants for male Laspeyresia youngana. Similarly male Barbara colfaxiana have been shown to be attracted to traps containing cis-9-dodece
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aceed6c8a271e684c88a9de3b88de3f5
https://doi.org/10.1007/bf01944150
https://doi.org/10.1007/bf01944150