The impact of combined environmental factors, such as temperature and CO₂, on the control of the powdery mildew of zucchini, caused by Podosphaera xanthii, and of different control measures has been studied on plants grown in phytotrons. Five experimental trials were conducted, and the powdery mildew severity of both treated and untreated zucchini plants was found to be significantly affected by the interaction between temperature (three different regimes: 16–18; 18–22; 22–26°C), CO₂ (two concentrations: 400–450 and 800–850 ppm) and the treatments. However, at the end of the trials, the efficacy of all the products was not affected by the different, tested environmental conditions. Sulphur consistently provided the highest disease control (75%–85% efficacy). Among the resistant inducers that were tested, calcium oxide was the most effective, in terms of powdery mildew control under all the conditions tested in phytotrons, reducing disease severity from 46% to 61%. Foliar applications of phosphite (14%–28% efficacy), Ampelomyces quisqualis (12%–23% efficacy) and potassium silicate (13%–24% efficacy) only slightly reduced the disease severity for all the tested temperature regimes and CO₂ concentrations, compared to the untreated control. The results obtained under our experimental conditions show that a possible increase in CO₂ concentration and temperature, which is expected for the next few years, should not influence the efficacy of the tested resistance inducers or of sulphur against powdery mildew on zucchini. Moreover, the suppressive effect of calcium oxide is in light of its possible use in greenhouses for zucchini powdery mildew control under 400–450 ppm of CO₂ and under enriched condition of 800–850 ppm of CO₂.

中文翻译：

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大气CO 2 升高和温度升高对西葫芦白粉病防治的影响

综合环境因素，如温度和二氧化碳，对控制由 Podosphaera xanthii 引起的西葫芦白粉病的影响，以及不同控制措施对植物培养箱中生长的植物的影响。进行了五项实验试验，发现处理过和未处理过的西葫芦植物的白粉病严重程度受温度（三种不同的制度：16–18；18–22；22–26°C）、CO 2 之间的相互作用的显着影响（两种浓度：400–450 和 800–850 ppm）和处理。然而，在试验结束时，所有产品的功效都没有受到不同的测试环境条件的影响。硫始终提供最高的疾病控制（75%–85% 功效）。在测试的抗性诱导剂中，氧化钙是最有效的，在 phytotrons 中测试的所有条件下，白粉病控制方面，将疾病严重程度从 46% 降低到 61%。叶面喷施亚磷酸盐（14%–28% 功效）、Ampelomyces quisqualis（12%–23% 功效）和硅酸钾（13%–24% 功效）仅略微降低了所有测试温度和二氧化碳浓度的疾病严重程度，与未处理的对照相比。在我们的实验条件下获得的结果表明，预计在未来几年内 CO2 浓度和温度可能会增加，不应影响测试的抗性诱导剂或硫磺对西葫芦白粉病的功效。而且，