Re: Another Question for Dr. Grewal


It is best to apply 2% ZeroTol spray when the plants are actively growing 
during the season.  Since there are no symptoms in the spring, thus no 
apparent damage to the plants, one should wait until summer.  The best time 
to apply is when the symptoms first begin to develop in late July and early 
August (in the Midwest).  If you know that you had foliar nematode 
infection on certain plants the previous year, you may apply one or two 
preventive sprays in late spring and early summer time.  It would not be of 
much use to spray when the plants are going dormant as nematodes may escape 
contact with the nematicide as the enter overwintering sites.  The best 
measure at this time would be to minimize nematode inoculum (source) by a 
good fall clean out.  Collect and burn all drying leaves and plant parts.

Parwinder Grewal

At 01:58 PM 01/08/2002 -0500, you wrote:
>Is it best to apply ZeroTol (I assume 3% solution?) as the plant emerges
>in the spring, during the season or as it is going dormant? -- or - all
>three?
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