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From GMPro

  • Subject: From GMPro
  • From: halinar@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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