TY  - JA
AU  - Williams,C.T.
AU  - Wratten,S.D.
TI  - The winter development, reproduction and lifespan of viviparae of Sitobion avenae (F.) (Hemiptera:  Aphididae) on wheat in England
PY  - 1987///
KW  - Barley yellow dwarf virus
KW  - England
KW  - Parasitism
KW  - Sitobion
KW  - Winter crops
KW  - Triticum
KW  - AGROVOC
KW  - Wheat
N1  - Tables, graphs, references p. 33-34
N2  - Viviparae of Sitobion avenae in clip-cages on winter wheat in field plots insouthern England were monitored throughout the 1980-81 winter to determine characteristics of development, reproduction and lifespan under winter conditions. Rate-temperature relationships for development and reproduction werewell described by straight lines when temperatures were measured above 3øC. A simple thermal-time scale could therefore be used for both processes. The parental morph and the time of year modified thermal-time requirements for the production of an adult's first 20 nymphs but did not affect those for development. For both alatae and apterae, nymph production per
T2  - Bulletin of Entomological Research
ER  -