Powdery mildew Leiveillula taurica Development After infection unseen

Powdery mildew Leiveillula taurica 흰가루병

Development (발생) • After infection unseen on leaf tissue for a latency period of 21 days (엽 침입 후 21일간 잠복기) • Development on the under side of the leaf 잎뒷면에 발생 • When first symptoms visible: many leaves already infected 초기 발견되었을 때: 다른 부위 잎 이미 감염 우려 • Leaves can not recover ! 발견후 회복 불가 • 1 % leaf infection results in 1 % production loss 1%감염 1%수량 감소 • Control from the first infection is very important 초기 방제가 매우 중요 • No powdery mildew resistant varieties exist (only torerant) 흰가루 내성 품종 개발됨 (저항성-tolerent)

Development 감염 • • • Infection can occur over a wide T° range (19 -33°C) 감염은 광범위한 온도범위에서 이루짐(19 -33°C) With changeable humidity 습도변화가 심할 때 Fungus grows in the stomata 곰팡이는 기공을 통해 침입 Production of spores on numerous, fine strands of stalks = white patches or mildew colonies 많은 량의 포자발생, 가는 균사 = 감염패치 또는 흰가루 다발 Air currents carry the spores to other leaves 공기이동에 의해 포자 다른 잎으로 전이 Can spread out also by workers clothing 작업자에 의해 전이가능

Powdery mildew, Leveillula taurica, grows through the stomates and produces white colonies of abundant spores (conidia) borne singly on stalks (conidiophores) on the underside of greenhouse pepper leaves. 흰가루, Leveillula taurica, 는 기공을 통해 침입하고 고추의 푸른 잎뒷면에 균사체와 포자로 이루어 진 흰감염부위 형성됨

Disease Management Plan 병관리 계획 • • • Restrict visitors access to the greenhouse 방문자 온실내부 출입 금함 Follow strict greenhouse hygiene throughout the season 재배기간동안 온실청결 엄수 Conduct a through year-end clean up and dispose the crop debris off-site or by burning 재배후 온실 청소 및 제거작물 소각 또는 원거리 폐기 Control outdoor weeds surrounding the greenhouse 온실주위 외부 잡초제거 Keep ornamentals and tropical plants outside the greenhouse 온실외부 관상수나 열대식물 식재 Improve greenhouse by a more stable humidity – avoid air currents and T° shocks 온실내 습도안정화, 공기이동/온도급변 방지

Chemical treatment – Sulphur 화학제 처리-유황 • • Prevention by the use of sulphur 92% 유황으로 방제 By vaporizer: 1 per 700 to 1, 000 m² 유황훈증기: 1 / 700 ~ 1, 000 m² Application when it’s cooler (evening) 저녁 온도가 낮아졌을때 살포 Duration: 2 -8 hours per night 살포기간: 2~8시간/야간 By strewing: every 4 rows - every fortnight - 3 -4 kg/ha 살포: 4줄당-4일간(야간)-3~4 kg/ha Apply uniformly and evenly according to a specified interval 특정 시간 간격에 따라 골고루 살포 No specified days to harvest Pay attention for plastic 비닐부식에 유의

Chemical treatment 화학제 살포 • • • Ortiva (Azoxystrobin) 3 days Silbako (Tebuconazole) 10 days Emenent (Tetraconazole) 3 days Sporgon (Prochloraz Mn) 5 days Apply as soon as first spots are present – repeat after 10 days 흰가루가 첫발생했을때 10일간격으로 반복 살포 • Apply with much water (rinsing plants) 물을 많이 뿌릴것(작물세척)

New product: Enzicur 새로운 상품: Enzicur • Natural enzyme lactoperoxidase 천연효소 (렉토프록시데이즈) • Potasium jodide Jodide 칼륨 • Potasium cyanate 시안안염칼륨 • No resistance possible 저항성없음 • Not systemic 침투제 아님 • Not yet available in Korea 아직 한국에서 사용되지 않음