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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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