共查询到20条相似文献,搜索用时 62 毫秒
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1发生及危害情况 爻纹细蛾是赤水市荔枝的主要害虫,以幼虫危害荔枝的果实、枝梢和叶片,引起落果、枝叶干枯,严重影响品质、产量和经济效益.在赤水市所有荔枝园均有不同程度的发生,其危害程度与冬季气温及管理水平有着密切关系,暖冬年份、管理较差的果园,发生较为严重,有的年份危害率可达80%,落果率70%以上,大部分秋梢干枯,次年花量减少. 相似文献
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醋栗透翅蛾是近年来严重危害黑穗醋栗的主要害虫。经观察发现 ,该虫 1年发生 1代 ,以 3龄以上老熟幼虫在枝条髓部越冬。 5月中旬老熟幼虫开始化蛹 ,6月中、下旬至 7月上旬为成虫羽化盛期。幼虫孵化后先蛀食腋芽、叶片、叶柄、嫩树皮 ,之后钻入枝条髓部蛀食危害。可在幼虫孵化初期和成虫羽化高峰期喷施化学药剂 ,防治效果较佳 相似文献
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莱西地区桃潜叶蛾的发生与药剂防治试验 总被引:1,自引:0,他引:1
桃潜叶蛾是桃产区普遍发生的害虫,由于目前生产中广泛采用的有机磷和菊脂类杀虫剂对桃潜叶蛾微小成虫及蛀入叶片内的幼虫防治效果较差,加之连年单一用药,人量杀伤天敌,害虫本身抗药性增加,1993年、1994年莱西地区桃潜叶蛾为害猖獗,大田防治用药4~5次后叶片受害率仍高达50%以上.引起了不同程度的早期落叶,严重影响了树势和花芽分化。为此,我们于1995~1996年对桃潜叶蛾的发生规律及有效防治药剂做了初步的研究,并取得了理想的大面积田间防治效果。现简报如下。一、材料与方法1995~1996年在莱西市星… 相似文献
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山药在浙南地区栽培历史悠久,因其营养丰富, 具有很高的滋补药用价值,又是餐桌上佳品,而备受人们喜欢.近年来.浙南地区种植面积在1 200 hm2左右.山药炭疽病是山药优质、高产的主要障碍.随着栽培面积扩大,病害发生加重.发病重的年份, 植株提早落叶、枯蔓,至10月份枯蔓株率达20%以上.为了有效治理山药炭疽病,笔者于2003~2007年对其发生特点和防治方法进行了调查研究. 相似文献
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Z. BANIHASHEMI 《Plant pathology》1990,39(2):309-315
Polystigma ochraceum is a major leaf pathogen of almond in Fars Province of Iran. Over a 4-year study period it was found that ascospore discharge began at flowering and continued for 4–5 weeks. The maximum discharge occurred at petal fall. The incubation period was estimated to be 4–5 weeks under experimental conditions. Although the mature ascospores could produce short germ tubes in distilled water or water agar, the fungus could not be cultured or grown on conventional media from either ascospores, pycnidiospores or stromatic tissues under laboratory conditions.
Of several systemic and non-systemic fungicides evaluated under field conditions, triforine at 100–400 μ/ml was most effective. Other fungicides which significantly reduced leaf infection were, in order of efficacy, copper oxychloride (2000 μg/ml), copper hydroxide (2000 mUg/ml), Bordeaux mixture (10 000 μg/ ml) and mancozeb (2000 μg/ml). Carbendazim and thiophanate methyl (500 μg/ml) increased the level of infection. One application of the fungicide at petal fall and then two at 14-day intervals were found to be effective in reducing the disease. 相似文献
Of several systemic and non-systemic fungicides evaluated under field conditions, triforine at 100–400 μ/ml was most effective. Other fungicides which significantly reduced leaf infection were, in order of efficacy, copper oxychloride (2000 μg/ml), copper hydroxide (2000 mUg/ml), Bordeaux mixture (10 000 μg/ ml) and mancozeb (2000 μg/ml). Carbendazim and thiophanate methyl (500 μg/ml) increased the level of infection. One application of the fungicide at petal fall and then two at 14-day intervals were found to be effective in reducing the disease. 相似文献
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The citrus leafminer,Phyllocnistis citrella Stainton, was first discovered in citrus groves in Israel in 1994. A biological control project was launched immediately and six species of natural enemies of the pest were introduced from Thailand, China, Australia and Florida. These were reared and released in citrus groves. At present, most have been recovered from the release sites and some seem to have become established, with relatively high rates of parasitization. The current status of the pest and of its indigenous and introduced natural enemies is briefly discussed. 相似文献
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