A Simple Technique, Concentration and Application Schedule for Using Neutralized
Other Title
利用亞磷酸簡便調配技術、合適濃度及施用方法防治作物疫病
Journal
植物病理學會刊
Journal Volume
18
Journal Issue
3
Pages
155-165
Date Issued
2009-09
Date
2009-09
Author(s)
Abstract
A simple method for application of phosphorous acid to control Phytophthora diseases was developed. The proposed method involves measuring equal weight of phosphorous acid and potassium hydroxide and dissolving phosphorous acid in water before adding potassium hydroxide. The pH of the neutralized phosphorous acid solution (NPA) is 6.2-6.7. The NPA concentration at 5000 mg/L was effective in controlling tomato seedling blight caused by Phytophthora capsici when using soil drench method. For suppression of lily leaf and blossom blight caused by Phytophthora parasitica, foliar application is much more effective than soil drench. However, NPA concentrations exceeding 2000 mg/L were phytotoxic to young plant tissues. The best results were achieved by applying NPA at the rate of 1000 mg/L for 3 times at one week intervals. Applying NPA to mother lily plants also effectively protected bulblets from infection by P. parasitica during storage periods.
研發一種簡便調製中和亞磷酸水溶液的技術，可用來防治作物疫病，該方法將亞磷酸(H3PO3)與氫氧化鉀(KOH)以1:1 (w/w)等重稱量後，先將亞磷酸溶解於水中後，再將氫氧化鉀加入溶解，該中和後的亞磷酸水溶液(neutralized phosphorous acid solution，簡稱NPA)的酸鹼值為pH6.2~6.7。防治由Phytophthora capsici引起的番茄幼苗根莖部疫病時，以較高濃度的NPA（如5000 mg/L）灌注根圈土壤的防治效果較佳。而防治由P. parasitica引起的白合地上部花器與葉片疫病時，以葉面噴部的效果較土壤灌注為佳。但NPA施用於地上部時，濃度超過2000 mg/L時易造成花器與幼嫩組織藥害。試驗中最佳的組合施用方法為，NPA的施用濃度為1000 mg/L，每隔7天施用一次，連續三次，防治白合疫病的效果最佳。此外，NPA施用於百合母株及其根圈土壤，亦能保護貯藏期的小種球，降低被疫病菌感染的機率。
Subjects
phosphorous acid
potassium hydroxide
Phytophthora parasitica
Phytophthora capsici
disease control
induced resistance
亞磷酸
氫氧化鉀Phytophthora parasitica
Phytophthora capsici
疫病防治
誘導性抗病
Publisher
中華民國植物病理學會
Type
journal article
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