Preventive Effect and Mode of Action of Repetitive Hot Water Spraying against Powdery Mildew in Strawberry
Penulis/Author
Tatsuo Sato (1); Harufumi Saito (2); Keisuke Maejima (3); Keiko Kuba (4); Prof. Ani Widiastuti, S.P., M.P., Ph.D. (5); Mioko Yoshino (6)
Tanggal/Date
2018
Kata Kunci/Keyword
Abstrak/Abstract
This study aimed to investigate the preventive effect of periodic hot water spraying against powdery mildew in
strawberry as an alternative to chemical application as a protection method. Young upper leaves of
‘Sachinoka’ were dipped in hot water at 50°C for 20 s. Conidia of powdery mildew were inoculated 24 h after
the treatment. The occurrence and growth rates of powdery mildew were apparently lower on leaves dipped in
hot water than on those left untreated. Thus, resistance against powdery mildew was thought to be successfully
induced by heat shock. Change in leaf temperature was tested using a prototype of a hot water sprayer at 57
±
2°C. The resultant rise in temperature and temperature attained varied widely across the leaves. Nonetheless,
the minimum requirement of a leaf temperature of 50°C in 10 s for inducing systemic resistance against crown
rot could be attained in the treated plants. In this study, weekly hot water spraying treatments were conducted
in ‘Sachinoka’ in 2008 and in ‘Tochiotome’ and ‘Hitachi-hime’ in 2009. In 2008, powdery mildew occurred
explosively in the non-treated plants. However, its occurrence in plants treated with hot water spraying was
less than that in the controls, but more than that after chemical application. In 2009, the occurrence rate was
lower than that in the non-treated group of 2008 and extremely low after hot water spray treatment and
chemical protection in both the varieties. Whether the difference in the occurrence of powdery mildew in both
the years was because of the difference in environmental conditions or the difference between the varieties is
not known. The plant height of ‘Hitachi-hime’ tended to become short after hot water spraying; however, no
serious effects were noted on the growth and yield of strawberry plants. In conclusion, heat shock treatment by
using hot water spraying can be considered an alternative method to chemical protection against mild
powdery mildew incidence in strawberry.
Rumpun Ilmu
Ilmu Hama dan Penyakit Tanaman
Bahasa Asli/Original Language
English
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
Preventive Effect and Mode of_Tatsuo_similarity.pdf
