OCR Text |
Show 'Fixed Copper' in Spray or Dust Controls Late Blight Funm, 1 Late blight is characterized by the destruction of the foliage of potatoes po-tatoes and to some extent the foliage fo-liage of tomatoes in wet fall weather. weath-er. The size and yield of potato tubers tu-bers may be greatly reduced if the tops are blighted early; if the blight comes late the principal loss is from rotting of the tubers either in the ground or in storage. With tomatoes toma-toes the loss results principally from rotting of the fruits on the vine. i sraje is caused by a fungus which lives over winter on infected potato tubers which may be used for seed, possibly on tubers left in the ground, and on potato refuse left on dumps or compost heaps. Dusting or spraying is the best way to prevent damage. A copper-lime copper-lime dust may be used, freshly mixed and applied in the early morning when the plants are wet with dew. Dusts known as fi::cri copper" dusts are now avails L. which are about as good as com lime dust, do not have to be fresh and may be applied at any time oi day when the air is still. For spraying, home-mixed bordeaux bor-deaux has proved most effective but other materials of the -fixed' copper" type are almost as good and are easier to mix and handle. Here the concentrated copper material such as copper oxide, is mixed with' M dh'eCted on the container and tra,ttan bing dilUted and talc as in the dusts. |