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On the first Instar Larvae of some Species of Otiorrhynchus found on Strawberries, with Notes on their Biology

Published online by Cambridge University Press:  10 July 2009

J. Havelock Fidler
J. Havelock Fidler
Affiliation:
Philip Buckle Research Scholar, Department of Agricultural Entomology, Victoria University of Manchester.
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Extract

1. There are four species of Otiorrhynchus which commonly, in both the larval and the adult stage, cause damage to strawberry plants.

2. The morphology of the first larval instar of these species is discussed from the point of view of their determination.

3. It is shown that although the larvae in this stage are superficially very similar, there are considerable differences in the chaetotaxy of the head and also in the form of the labrum and the setae situated upon it.

4. Similarly there are variations in the position and size of the setae on the dorsum of both the thorax and abdomen.

5. A table is drawn up summarising all these characters in each of the four species.

6. A brief description of the present knowledge of the biology of these species is also given. It appears that although all of them are usually parthenogenetic, it is at present uncertain whether they can ever reproduce sexually, since the presence of males has as yet not been recorded.

7. These species usually have only one generation in the year, ovipositing in mid-summer and over-wintering as well developed larvae. In the case of O. sulcatus and O. ovatus, however, adults may emerge late in the summer and, having hibernated as adults, lay eggs in the early spring following.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 27 , Issue 3 , September 1936 , pp. 369 - 376
Copyright
Copyright © Cambridge University Press 1936

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