Abstract:
There were tested water extracts from Syringa vulgaris and
Pyrethrum parthenium. They did not prove significant differences of decrease
of the air attack of Colorado potato beetle (Leptinotarsa decemlineata), the
activity of eggs – laying and the occurrence of larvae in comparison to the
control. Interesting trends of lower-eggs lying and a lower larvae occurrence
were discovered. The liquid spray against the late blight (Phytophthora
infestans) did not significantly decrease neither occurrence of late blight or
the yield. The production of the bio-potatoes is only 0,2 % of all potatoes
production in the Czech Republic. The aim of this experiment was to try
alternative methods of regulation of Colorado potato beetle and late blight
(the biggest harmfull organisms of potatoes). For biological agriculture
could be also suitable water extracts. These are possible to use as protection
of potatoes against unfavorable factors (Colorado potate beetle and late
blight) and increase yield and quality of production.
