From GMPro
- Subject: From GMPro
- From: h*@open.org
- Date: Tue, 29 Oct 2002 23:23:10 -0800 (PST)
* Foliar nematodes (Aphelenchoides fragariae and Ditylenchus dipsaci)
can cause major damage to hostas. Research at Ohio St. Univ.-OARDC
showed that most standard nematicides and several insecticides can
substantially reduce nematode multiplication in leaves and the soil.
Nematologist Parwinder Grewal found Dylox (80S) and Mocap reduced
nematode multiplication in hosta leaves by as much as 90%, 45 days
after treatment. Oxamyl, diazinon, Dylox (6.2G), ZeroTol and
insecticidal soap killed 60%-70% of nematodes. Grewal said no
nematicides fully cure the problem after plants are infected. A.
fragariae, which can feed on soil fungi, also has the ability to
overwinter by moving deep into the soil to escape freezing
temperatures. Experiments with diazinon, Mocap, oxamyl, ZeroTol and
Dylox showed as much as 75% nematode control in the soil. Hot-water
dips (124 degrees F) of infected leaves provided 100% nematode
control. grewal.4@osu.edu; http://fusion.ag.ohio-state.edu/news/
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