Pesticide behaviour in hydroponics

Coosemans J., . (1990) Pesticide behaviour in hydroponics. [Proceedings Paper]

One of the most important objectives to introduce soilless cultures was to reduce hytopathological problems originating from soil. In hydroponic culture attention was given originally only to fungi well adapted to humid circumstances surviving with zoospores e.g. Pythium and Phytophthora and Olpidium as well as vectors of viruses. Beside these fungi spores of fungi causing vascular diseases e.g. Verticillium Fusarium and bacteria e.g. Corynebacterium can be spread very well in recirculating nutrient solutions. The possibilities of adding hytopharmaceutical products to the hydroponic system either to control root diseases or to act against the aerial part of the plants are discussed. A lot of characteristics of the pesticides determine their usability. The water solubility and the concentration required to act as a fungicide. The dose response for inhibition of mycelial growth or spore germination is illustrated for carbendazim metalaxyl and etridiasole related to important fungi as Pythium Phytophthors Cylindrocarpon. The systemicity especially to control air borne diseases e.g. mildew and all kinds of insects - white fly mites- and the residue in leaves and fruits as illustrated by the concentration of oxamyl in the hydroponic system related to the concentration in fresh strawberry fruits. The phytotoxicity : most of the actually treated pesticides are formulated to be used on the aerial parts of the plants which are protected by a cuticula. Formulation additives or surfactants will be toxic when in contact with the roots and quite a lot of surfactants influence the activity of the zoospores of Olpidium. This will be illustrated for a lot of nonionic anionic or cationic surfactants after various contact periods

Full text available from:

Abstract

One of the most important objectives to introduce soilless cultures was to reduce hytopathological problems originating from soil. In hydroponic culture attention was given originally only to fungi well adapted to humid circumstances surviving with zoospores e.g. Pythium and Phytophthora and Olpidium as well as vectors of viruses. Beside these fungi spores of fungi causing vascular diseases e.g. Verticillium Fusarium and bacteria e.g. Corynebacterium can be spread very well in recirculating nutrient solutions. The possibilities of adding hytopharmaceutical products to the hydroponic system either to control root diseases or to act against the aerial part of the plants are discussed. A lot of characteristics of the pesticides determine their usability. The water solubility and the concentration required to act as a fungicide. The dose response for inhibition of mycelial growth or spore germination is illustrated for carbendazim metalaxyl and etridiasole related to important fungi as Pythium Phytophthors Cylindrocarpon. The systemicity especially to control air borne diseases e.g. mildew and all kinds of insects - white fly mites- and the residue in leaves and fruits as illustrated by the concentration of oxamyl in the hydroponic system related to the concentration in fresh strawberry fruits. The phytotoxicity : most of the actually treated pesticides are formulated to be used on the aerial parts of the plants which are protected by a cuticula. Formulation additives or surfactants will be toxic when in contact with the roots and quite a lot of surfactants influence the activity of the zoospores of Olpidium. This will be illustrated for a lot of nonionic anionic or cationic surfactants after various contact periods

[error in script]

Item Type:	Proceedings Paper
Additional Information:	4 tables 5 ref.; Summary En
AGROVOC Term:	PLAGUICIDAS
AGROVOC Term:	CULTIVO HIDROPONICO
AGROVOC Term:	HONGOS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15003

Actions (login required)

View Item