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The Tobacco Capsid (Engytatus volucer, Kirk.) in Rhodesia

Published online by Cambridge University Press:  10 July 2009

J. Isgaer Roberts
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Extract

1. The Hemipterous fauna of the tobacco plant in Rhodesia during the growing season is confined to a Coreid, Aleurodid, Jassid and a Capsid.

2. A description of the adult and various instars of the Capsid, Engytatus volucer, Kirk., is given.

3. The habits of the insect on tobacco are discussed.

4. Attempted transmission of tobacco mosaic by Hemiptera found on tobacco plants failed.

5. Further experiments with the macerated contents of the thorax of E. volucer have proved it to cause a rolling and puckering of the leafsurface, which is termed “crinkle.”

6. Crinkle is caused by the poisonous nature of the saliva which spreads rapidly through the interior of the leaf. The salivary action does not affect localised centres to any appreciable extent so as to cause a “shot-hole” effect, as observed with other Capsids. The feeding sites are only noticeable when the leaf is held up to the light; rapid translocation currents cause its action to be spread over larger areas.

7. The injury is aggravated in weakened plants grown under adverse conditions, such as the striking of a hard pan in the sub-soil or a stone, or water deficiency.

8. Control can be effectively carried out by thorough cultivation of the soil, and the choosing of suitable sub-soils for root development. Early planting in December is recommended, or even earlier if rains are suitable, so that the plants will be well established before the height of infestation in April.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 21 , Issue 2 , July 1930 , pp. 169 - 183
Copyright
Copyright © Cambridge University Press 1930

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