Control of Salvinia; a host plant of Mansonia mosquitos.

Pentachlorophenol (12-16% PCP) was found to be a satisfactory herbicide for the control of Salvinia-a weed pest of irrigation and agriculture and also a host plant of Mansonia mosquitos. Applied at the dosage of eight to ten US gallons per acre (diluted with water to give a spray of 160 US gallons per acre), this chemical killed all the young plants and most of those in the middle stage of development in seven to ten days. For the full-grown plants, two applications-the first at the higher rate of ten US gallons per acre-were necessary.