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  • From: deberryemail-website AT yahoo.com
  • To: Market Farming <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Bt and different kinds
  • Date: Mon, 24 Aug 2009 18:42:09 -0700 (PDT)

I have mixed Dipel and pyganic and used on heavily infested Broccoli with good results.  Last year on fall broccoli only one application was need just before the heads started to form.
 
Charles

 

From: Bill Shoemaker <wshoemak AT illinois.edu>
To: Market Farming <market-farming AT lists.ibiblio.org>
Sent: Monday, August 24, 2009 7:56:37 AM
Subject: Re: [Market-farming] Bt and different kinds

Bt kurstaki is the same, whether its marketed as DiPel, Thuricide or another formulation. I've never seen a difference in brand names. The reason the problem is worse in the Fall is because Cabbage Looper is really a late summer/Fall pest. The other two crucifer worms can be there in early summer, but if you grow your own transplants you may have less of a problem with diamond-back moth.

An important key to success with Bt is to use it before the larvae reach the 4th instar (they grow through 5 instars, each successively bigger). So if you already have large worms, the Bt may not be as effective. You can use a pyrethrum, like pyganic, to knock them down first, then the Bt may be more effective. But I'd be concerned in you have cabbage looper, they can be pretty tough.

Bill


---- Original message ----
>Date: Sun, 23 Aug 2009 22:40:58 -0700 (PDT)
>From: jay sleichter <jaysleichter AT yahoo.com
>Subject: [Market-farming] Bt and different kinds 
>To: Market Farming <market-farming AT lists.ibiblio.org>
>
>  I need help making up my mind. The problem is       
>  cabbage loopers and imported cabbage worms are     
>  eating my newly transplanted broccoli.  I also just 
>  transplanted cauliflower also. This spring I did not
>  have a single hole in any of my broccoli or         
>  cauliflower. It was outside, just as this stuff is 
>  this time.  The fall must be different.             
>                                                       
>  I would like to know what is the best kind of Bt to 
>  use?  I know the Bt "K" is the best.  It needs to be
>  able to be ordered online and reasonable priced.  I 
>  have ask around and hunted for it locally, but     
>  no-one carries it.                                 
>                                                       
>  Which is better, Dipel, Thuricide,  or some other   
>  type?  As I said before, I will be spraying this on
>  cauliflower, broccoli, probably spinach and lettuce 
>  (the last two, if needed)  I have around 150       
>  broccoli, 100 cauliflower, 240 row feet of lettuce 
>  and spinach (if it all comes up).                   
>                                                       
>  Thanks,                                             
>                                                       
>  Jay                                                 
>________________
>_______________________________________________
>Market-farming mailing list
>Market-farming AT lists.ibiblio.org
>http://lists.ibiblio.org/mailman/listinfo/market-farming
>
William H Shoemaker, UI-NRES
Sr Research Specialist, Food Crops
St Charles Horticulture Research Center
535 Randall Road  St Charles, IL  60174
630-584-7254; FAX-584-4610
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