Than Than Sein
In Myanmar, there are several constraints to achieving yield potential of pitaya in different agro-ecological zones because of weather and soil conditions. In southern Shan State at 1200 m asl, good vegetative growth can be found. Tropical weather in dry zone, e.g., Poppa and Mandalay regions made more tasty than other region but fruit size is smaller. Wet weather and bad cultural practices lead to serious occurrences of diseases. Several important diseases have also been observed in the growing areas including severe stem rot, stem canker, soft rot and anthracnose damage to plants and fruits. Disease-free and high yielding varieties are not available to the farmers. Therefore, some varieties have been attacked by pests and diseases after 2-3 years of planting and the plants are in deep need of replacement, especially with new varieties. Macrophomina phaseolina causes brown rot on the stems of pitaya, and Colletotrichum gloesporiodes (anthracnose) concentric haloes on stems and fruit producing from the plantation of Yangon region in lower Myanmar. Trichoderma isolate was utilized as bio-control agent to control the fungal disease and Trichoderma compost for the protection of soil borne fungal diseases in organic pitaya. In this study, two fungal infected plant tissue and Trichoderma isolate strains were made in dual culture test. In laboratory test, bio-control agent could colonize well on pathogens. Organic farming practices which made reduction of fungal disease attack on pitaya production .