Survey of Overwintering Inoculum Potential of Anthracnose of Sweet Persimmon Caused by Colletotrichum gloeosporioides

In 2006 to 2007, the potential inoculum source of the anthracnose of sweet persimmon caused by Colletotrichum gloeosporioides was surveyed. The infected twigs, buds, dead twigs, petiole, leaves, dropped fruits were collected and tested for their possibility as overwintering inoculum. The detection rates of the pathogen from various parts of sweet persimmon tree were varied. When the collected samples were examined in April. Over than 93.3% of infected twig samples were harbored mycelia of C. gloeosporioides, and 46.7% of infected buds, 36.7% of dead twigs, 23.3% of petioles, and 16.7% of leaves were beared pathogenic fungus. No pathogenic fungus were detecded from healthy twigs and buds. Infected twigs and bud was important overwintering sites and formed conidia actively in next spring. The infected twigs, leaves, petioles, and fruits in growing season produced great number of conidia and caused active dissemination of the anthracnose disease in sweet persimmon. In growing season, all of the infected parts, such as twigs, leaves, petioles, and fruits produced pathogenic fungus.

감나무 탄저병균(Collectotrichum gloeosporioides)의 월동 전염원 조사

2006년에서 2007년까지 2년간 자연상태에서 월동후 식물체 부위별 단감 탄저병의 병원균 분리비율을 조사하기 위해 병든 가지의 병반과 눈, 죽은 가지, 잎자루, 잎, 건전한 가지와 눈, 월동한 과실 등에서 조사를 하였다. 4월에 조사한 결과 병든 가지의 병반에서 93.3% 분리되었으며, 병든 가지 눈에서 46.7% 분리되었으며, 죽은 가지에서 36.7% 병원균이 분리되었다. 잎자루에서 23.3% 분리되었으며, 잎에서 16.7% 분리가 되었으며, 낙과된 과실에서 6.7% 분리되었지만 건전한 가지와 눈에서는 병원균이 분리되지 않았다. 그러나 생육중에 가지, 잎, 잎자루, 과실에 발생한 병든 부위에서는 병원균이 100%분리되었다.