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Observations on the effect of DDT formulations on the yellow tea mite, Hemitarsonemus latus (Banks), in Uganda

Published online by Cambridge University Press:  10 July 2009

J. C. Davies
J. C. Davies
Affiliation:
Department of Agriculture, Uganda.
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Extract

The effect of DDT applied to cotton plants four times at 10-day intervals at a rate of 1 lb. active ingredient per acre per application against Hemitarsonemus latus Banks was studied at Serere Eesearch Station, Uganda. DDT applied as a 10 per cent, dust, or in a spray from a 50 per cent, wettable powder increased the damage caused by the mite, while DDT applied in a spray from a 25 per cent. miscible liquid decreased it.

Another trial using a DDT miscible-liquid spray applied at intervals of 10, 15 and 20 days at 1 lb. active ingredient per acre per application demonstrated partial control of the mite. However, when spraying ceased, tea-mite damage increased. At the final count all spray intervals showed significantly less damage than the control and there was an over-all significant difference between spray treatments and the control. In both trials the number of mite-infested plants increased in an exponential manner with time.

It is not considered that the present recommended practice of applying DDT four times, at 15-day intervals, in a spray from 25 per cent, miscible liquid at 1 lb. active ingredient per acre will cause an increase of the mite on peasant-grown cotton in Uganda, although it will only partially control any infestation of it that is present.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 54 , Issue 3 , November 1963 , pp. 425 - 431
Copyright
Copyright © Cambridge University Press 1963

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