Selection of disease resistant cultivars white timber roots.Breeding in the past, they will focus on improvements to the output of rubber, latex, high quality and good disease resistance, but breeding more than timber, rubber, new species are introduced to farmers to plant rubber. Requires a period of not less than 25 years (and faculty, kannika 2545 (2002)), and in each step there is a daunting task, but it is important that the current breed of rubber cultivation expert farmers RRIM 600 is widely used because it is the breed of rubber, latex output h. Farmers turn to store rubber seeds a good species, most of which are the origins of RRIM 600. As a result, the original breed of rubber that is used as the origins. There is much reduced and the remaining ones in some areas and rubber varieties are weak RRIM 600 varieties of root disease is very white (urai and faculty, 2539 (1996)), thus qualifying the traditional varieties of rubber saplings. To be used as the origins of white root disease resistance is thus extremely useful.Selection of resistance or tolerance of white root disease. In the introduction to a root disease caused by fungi is preparing, planting and timber roots to infection by an appropriate method. From a study of emotion (2541 (1998)) collected samples of mushrooms and roots, root disease of rubber rubber white. Rubber plantations in areas where the disease is found separately purified spores and fungus collections collects for experiments in the laboratory by means of tissue transplant ting then study and compare the basic characteristics on the growth of fungi, each strain by vitro fungi on food feed fuel to po.Tato dextrose agar (PDA) and then farming fungi species in microporus R. Bale bags every mushroom fungi. Recipes that use is rubber wood sawdust, water and sugar, Bran. The ratio 100: 3: 2: 50 by weight. A study on the difference of the species R. root diseases caused by fungi, white timber lignosus number 24 varieties by studying how growth and fiber characteristics on the PDA diet found that fungal strain W 1 W 2 4 WCP WSR 6 W 3 W 5 and 1 small can grow WKM is the temperature 20 degrees Celsius. While other species cannot thrive. But I could not find a difference in growth and fiber when fed on food at room temperature. Best of difference in their ability to cause disease of fungi with the rubber plant varieties and the BPM PR255 24 fungi, each species can also cause a disease with the rubber saplings, each species is different and not compatible can be grouped (2547 (2004), phayao and Board) from the rubber Research Institute's study (2547 (2004)) by:Batua, a disease brought in isolation And proven disease in experimental nurseries By embedding each of diameter 3-4 inches long, 8 inches into the soil with black plastic bags in the size 12x18 inches with tyre plant trees to view the symptoms as the disease of the plant found that timber species suggest that weak white root disease is RRIM600 (55 percent) also are 24 BPM (19.6 percent.ซ็นต์), while the leading Committee and urai (2539 (1996)) the dares suggested varieties rubber floor 1 of 5 species: RRIM600 KRS156 PR 26 PR 255 GT1 and planting around the cone so the branches are rubber eye white root disease. Experimental results showed that timber species suggest that the weakness is the smallest breed of moderate weak PR PR 261 is 255 and GT 1 and cultivars that are the most vulnerable, namely KRS156 and RRIM600, and now still can't find timber species suggest that root disease resistant White. Because there is no root disease resistance studies in conventional varieties and white. Therefore, this study focuses specific education to native species. Which is a species that has a wide genetic base for a mud that has the potential to be used as a disease resistant root causes? For the production of commercial-timber trade continues.
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