NEWSLETTER From Tomen Corporation
Two natural enemies registered in Japan
(Written on May 13,1996)

Encarsia formosa and Phytoseiulus persimilis were registered in March, 1995 in Japan. In Japan, natural enemies are regarded as pesticides and regulated by the pesticide regulation law.
There are of course some opinions that the regulation should be laxed but at this moment one should observe the existing laws.

Even though natural enemies were registered after 4 years glasshouse bioefficacy trials, they can only be used on registered crop, i.e. Encarsia formosa against Trialeurodes vaporariorum on tomato, Phytoseiulus persimilis against Tetranychus urticae on strawberries, utterly different situation from European countries and U.S.A.

The sales so far is no so surprising but covers 200 ha of tomato house out of 6000 ha tomato in Japan. Growers and field researchers are longing for early registration of Diglyphus isaea and Dacnusa sibirica. Phytoseiulus is poor sales results. Reasons are mainly that most miticides are still effective enough against glasshouse living Tetranychus urticae.

Tetsuo Wada

Any comment and question are welcome.

e-mail adress
tetsuo-wa@aix.or.jp (home)
wada_tetsuo@arsyta-ls.com (office)