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122. Derived from: Yu, H.-S., E. F. Legner & R. D.
Sjogren. 1974. Mosquito control with European green hydra
in irrigated pastures, river seepage and duck club ponds in Kern County. Proc. Calif. Mosq. Contr. Assoc., Inc. 42:
77-78. In the Aedes nigromaculis habitat
a significant host population reduction appeared 24 hours after hydra were
inoculated in pastures, with 57.8 percent actual destruction. Host destruction gradually increased to
84.5 percent, the differences in density between inoculated plots and the
control being significant at the 95% level.
The pasture mosquito population before treatment averaged 11.70
larvae/dip in the control and 11.75/dip in the treated areas. Mosquito density in the controls peaked in
mid summer, while areas that had been inoculated with hydra were
significantly lower. After drying and
subsequent reflooding in late summer the Aedes population did not
recover the high density observed earlier, but a significantly lower density
was recorded in the hydra treated areas. |
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