. Better fruit. Fruit-culture. ipi6 BETTER FRUIT Page 57 Rhizoctonia on the various hosts sug- gests nothing of promise along the line of selection of varieties for resistance. While some varietal dilTerences have been noted, the outlook is not hopeful, and it is not probable that highly resist- ant or imnume varieties can be obtained by either breeding or selection. Cul- tural practices then must be resorted to in the control of this disease, and the following tentative suggestions are presented: 1. Use clean soil free from Rhizoc- tonia for the growth of tomato plants if they are to be trans
. Better fruit. Fruit-culture. ipi6 BETTER FRUIT Page 57 Rhizoctonia on the various hosts sug- gests nothing of promise along the line of selection of varieties for resistance. While some varietal dilTerences have been noted, the outlook is not hopeful, and it is not probable that highly resist- ant or imnume varieties can be obtained by either breeding or selection. Cul- tural practices then must be resorted to in the control of this disease, and the following tentative suggestions are presented: 1. Use clean soil free from Rhizoc- tonia for the growth of tomato plants if they are to be transplanted, or if the soil is infected use some method of sterilization. 2. Avoid ground upon which pota- toes have been grown during the past four or five years. Give attention to the possible occurrence of the dis- ease on some other crop th^t might have infected the soil. Cereals and other grasses are never attacked by Rhizoctonia. 3. Practice a culture method that will supply the growing plants with an abundance of moisture. Lack of moist- ure increases the severity of the dis- ease, since the fungus is constantly cut- ting down the supply of absorbing roots, and so making it more diflicult for the plant to get suflicient water. Good cultivation for the aeration of the soil is also an important factor. 4. Use a liberal amount of fertilizer so as to stimulate the gi-owth of the plants, and if the soil is known to be acid, correct this acidity by the appli- cation of lime. Rhizoctonia grows better in an acid soil tliaii in those â which are neutral or alkaline. 5. In transplanting to the field do not set the plants too shallow. Deep set- ting gives a greater opportunity for the development of adventitious fibrous roots to take the place of those killed by the fungus. It may even be ad- visable to set the plants in shallow trenches and gradually fill around them with successive cultivations. fi. Growing the plants in the lield to avoid transplanting is sometimes of value. Injury
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