Abstract
비닐하우스에서 고추 흰가루병은 1년 내내 발생하는 가장 문제시되는 병해중의 하나이다. 본 연구에서는 키틴 함유배지에서 자란 L. enzymogenes strain C-3와 Chromobacterium sp. strain C-61의 혼합배양액에 의한 흰가루병 방제효과를 평가하였다. 모든 실험에서 고추 잎 뒷면에 분포하는 흰가루는 혼합배양액 살포 3일 후 완전 사라졌다. 그러나 동일 부위에서 새로운 흰가루가 나타나기까지의 기간(방제지속기간)은 살포후의 환경조건에 따라 크게 달랐다. 특히, 오전 9시보다 오후 6시에 살포되었을 경우, 그리고 살포 다음날 비가 왔을 경우에는 그 방제지속기간이 훨씬 더 길었다. 이것은 살포 후의 환경 조건이 병 방제효과에 크게 영향을 미칠 것이라는 것을 암시한다. 배양 원액은 병 발생이 심한 포장에서 5일 간격, 병 발생이 시작되는 포장에서 7일 간격 살포함으로서 95% 이상의 완전한 방제효과를 보여 주었다. 10배 희석 액도 동일 방법으로 살포하였을 경우 81% 이상의 방제 효과를 나타냈다. 따라서 본 배양액은 고추 흰가루병 방제에 실제 이용 가능할 것으로 판단된다. Powdery mildew of pepper is one of the most devastating diseases which is occurring all the year under greenhouse condition. In this study, control efficacy against powdery mildew was evaluated by mixed culture solutions of two chitinolytic bacteria, Lysobacter enzymogenenes strain C-3 and Chrornobacterium sp. strain C-61, cultivated in the chitin-supplemented medium. In all experiments, white powder on the reverse side of pepper leaves perfectly disappeared 3 days after application of mixed culture solutions. However, periods required for formation of new white powder on the same sites after application (control-lasting period) were largely differed according to environmental conditions. In particular, the control-lasting period was much longer when sprayed on 6 PM than 9 AM and especially, on rainy days than sunny days. This indicates that control efficacy of culture solution may be largely affected by environmental conditions after application. The undiluted culture solution resulted in a perfect control with control value more than 95% by application of 5-day-intervals under severely diseased field and 7-day-intervals under disease-started field. A ten-fold diluted product also showed control value more than 81% by application of the same method. These results suggest that this culture solution can be practically used to control powdery mildew disease in pepper plants.
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Claims 7
Claim · model-written summary
Mixed culture application eliminated visible powder on pepper leaves after three days.
- Taxon
- peppere0
- Treatment
- application of mixed culture solutionse0
- Outcome
- white powder on the reverse side of pepper leavese0
- Direction
- disappearede0
- Value
- 3 dayse0
Not reportedComparator
Verbatim
e0“white powder on the reverse side of pepper leaves perfectly disappeared 3 days after application of mixed culture solutions”
Claim · model-written summary
The control lasting period varied with postapplication environmental conditions.
Not reportedDirection
Verbatim
e0“control-lasting period) were largely differed according to environmental conditions”
t0“Pepper”
Claim · model-written summary
Spraying at 6 PM gave longer lasting control than spraying at 9 AM.
Verbatim
e0“control-lasting period was much longer when sprayed on 6 PM than 9 AM”
t0“Pepper”
Claim · model-written summary
Spraying on rainy days gave longer lasting control than sunny days.
Verbatim
e0“control-lasting period was much longer when sprayed on 6 PM than 9 AM and especially, on rainy days than sunny days”
t0“Pepper”
Claim · model-written summary
Undiluted culture achieved over 95% control under the stated application schedules.
- Taxon
- Peppert0
- Treatment
- undiluted culture solutione0
- Outcome
- control valuee0
- Direction
- perfect controle0
- Value
- more than 95%e0
- Qualifier
- 5-day-intervals under severely diseased field and 7-day-intervals under disease-started fielde0
Not reportedComparator
Verbatim
e0“The undiluted culture solution resulted in a perfect control with control value more than 95% by application of 5-day-intervals under severely diseased field and 7-day-intervals under disease-started field.”
t0“Pepper”
Claim · model-written summary
Tenfold diluted culture achieved over 81% control.
- Taxon
- Peppert0
- Treatment
- ten-fold diluted producte0
- Outcome
- control valuee0
- Direction
- more thane0
- Value
- more than 81%e0
Not reportedComparator
Verbatim
e0“A ten-fold diluted product also showed control value more than 81% by application of the same method.”
t0“Pepper”
Claim · model-written summary
The authors propose practical use of the culture for pepper powdery mildew control.
Verbatim
e0“this culture solution can be practically used to control powdery mildew disease in pepper plants”