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黄杨卷叶螟属鳞翅目 ,螟蛾科。在浙南山区景宁县每年 5至 6月花卉小叶黄杨产区严重发生危害 ,是近年来新发现的一种花卉黄杨主要害虫 ,给县城绿化带景观造成很大影响。其危害频率和程度呈逐年加重趋势。为此 ,本站对其发生及防治进行了多年的观察与试验 ,现简报如下。1 生活习性浙南山区景宁县 1年发生 4代。越冬幼虫次年4月初开始化蛹 ,4月下旬至 5月上旬出现成虫。各代幼虫发生危害期分别为 5月中旬至 6月下旬 ,6月下旬至 7月下旬 ,7月下旬至 9月上旬 ,9月中旬至 10月下旬幼虫在虫苞内结茧越冬。黄杨卷叶螟主要危害小叶黄杨、萑舌黄杨、… 相似文献
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本文对农林作物重要害虫丽绿刺蛾在泉州地区的生物学特性及其防治措施进行了研究。通过室内饲养和野外调查相结合的方法,明确了丽绿刺蛾在泉州地区1年发生2代,以老熟幼虫在茧内越冬。第一代幼虫从5月下旬始见,直至7月下旬,老熟幼虫在7月中旬以后陆续结茧化蛹;成虫7月下旬开始羽化、产卵,直至9月中旬。第二代幼虫8月上旬开始孵化,老熟幼虫在10月上旬以后陆续结茧,并在茧内越冬;翌年4月下旬老熟幼虫(越冬代)化蛹,成虫从5月中旬至6月下旬羽化、交配、产卵。结合防治实践,探讨了人工、物理、生物、药物方法相结合的丽绿刺蛾害虫综合防治措施。 相似文献
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甘蔗二点螟的生物学与测报调查方法初探 总被引:1,自引:0,他引:1
二点螟是我省甘蔗上的主要害虫。根据笔者多年的调查观察,本文报导甘蔗二点螟的生物学及测报调查方法。1甘蔗二点螟的生物学在我省,甘蔗二点螟一年发生4~5代,以老熟幼虫和少数低龄幼虫在宿根蔗残、残留蔗茎及秋冬笋枯南内越冬。越冬幼虫在3月底至4月下旬化蛹、羽化为成虫。各代幼虫主害时期:第一代4月底~5月下旬;第2代6月下旬~7月中旬;第三代7月下旬~8月中旬;第四代8月下旬~9月上旬。成虫多在夜晚羽化,白天躲避,晚间活动,靠雌蛾分泌性外激素,引诱雄蛾交尾;第二天晚上开始产卵,持续4~5d,产卵200粒左右。卵多产在l~4叶的… 相似文献
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美国白蛾[Hyphantria cunea(Drury)]又称秋幕毛虫、秋幕蛾,是世界性检疫害虫,我国列为2类进境植物检疫性有害生物。该虫原发于北美洲,1979年首次在我国丹东发现。近年来在北方地区呈现蔓延扩散趋势,极大地威胁着农、林业生产安全。1发生为害情况美国白蛾在我国北方地区一般1年发生3代。以蛹越冬。每年4月下旬至5月下旬是越冬代成虫羽化和产卵期,幼虫5月上旬开始为害,一直延续至6月下旬。7月为第1代成虫期。第2代幼虫7月中旬开始发生,8月中旬进入为害盛期,经常发生整株树叶被吃光的现象。8月中旬第2代成虫开始出现,第3代幼虫从9月上旬开始为… 相似文献
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荔枝泥蜂透翅蛾的生物学特性及其防治 总被引:1,自引:0,他引:1
通过室内饲养和室外观察研究,对荔枝泥蜂透翅蛾各虫态的形态特征进行了描述,基本了解其生活习性及生活史。此虫在广西1年发生1代。以幼虫在寄主蛀道内越冬,4月下旬至6月初为成虫羽化期,5月至6月上旬产卵,6月中旬至7月上旬为卵孵化期。提出了荔枝泥蜂透翅蛾的初步防治建议。 相似文献
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黄杨金星尺蠖Calospilos suspecta(Wawen)严重为害大叶黄杨,过去研究甚少。本文根据作者自1983年以来的观察研究记述该虫的发生与为害情况,包括试用7种农药对其防治的初步结果。证实该虫在武汉地区1年发生3代,以第三代蛹越冬,第二代蛹越夏。越冬代成虫出现在4月中旬到5月下旬。第一代幼虫发生在4月中旬到5月中旬,成虫出现在6月上旬至下旬。第二代幼虫发生在6月中旬到7月上旬,成虫出现在8月下旬到9月下旬。第三代幼虫发生在9月中旬到10月中旬。为害最重的是第二代。化学防治以选用乐果或敌百虫效果较好。 相似文献
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观察实验表明,在湖北柳蝙蛾1-2年完成1代,以卵或幼虫8月中旬、9月中旬越冬,越冬卵4月下旬至5月中旬孵化,5月下旬至9月中旬为幼虫蛀干危害期。柳蝙蛾的防治,主要采取加强果园管理,增强树势,清除园内杂草和园周杂灌,树干涂白;园内、园周用白僵菌防治在地表取食腐殖质的低龄幼虫;铁丝掏孔,塞入磷化铝熏蒸蛀干幼虫等综合措施。 相似文献
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苹果蠹蛾的生物学特性及消长动态 总被引:6,自引:0,他引:6
苹果蠹蛾(Cydia pomonellaL.)在甘肃张掖地区1年发生2代和一个不完整的第3代,以老熟幼虫在粗皮裂缝、翘皮下、树洞中、主干分枝及主枝分叉处的缝隙中结茧越冬。4月上旬,越冬幼虫陆续开始化蛹,5月中旬为越冬代成虫羽化高峰期,5月中下旬1代幼虫蛀果为害,7月中下旬为1代成虫羽化高峰期,7月中下旬至8月上旬为2代幼虫为害高峰期,9月中下旬出现不完整第3代幼虫。在甘肃张掖地区,6月中旬至7月上旬越冬代成虫和第1代成虫之间有一段明显的间断期,说明第1代苹果蠹蛾发生的趋势相对较为独立,世代重叠现象发生不重。 相似文献
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苹果蠹蛾的生物学特性及消长动态 总被引:2,自引:1,他引:1
苹果蠹蛾(Cydia pomonellaL.)在甘肃张掖地区1年发生2代和一个不完整的第3代,以老熟幼虫在粗皮裂缝、翘皮下、树洞中、主干分枝及主枝分叉处的缝隙中结茧越冬。4月上旬,越冬幼虫陆续开始化蛹,5月中旬为越冬代成虫羽化高峰期,5月中下旬1代幼虫蛀果为害,7月中下旬为1代成虫羽化高峰期,7月中下旬至8月上旬为2代幼虫为害高峰期,9月中下旬出现不完整第3代幼虫。在甘肃张掖地区,6月中旬至7月上旬越冬代成虫和第1代成虫之间有一段明显的间断期,说明第1代苹果蠹蛾发生的趋势相对较为独立,世代重叠现象发生不重。 相似文献
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Annual weeds germinating after planting strawberry (Fragaria chiloensis (L.) Duch. cv. Cambridge Favourite) in late March had no effect on crop growth if removed by late May. Dense weed cover thereafter severely inhibited stolon growth, virtually eliminating it if allowed to remain beyond mid-August. Shading by weeds inhibited leaf production and caused etiolation of existing leaves. New leaves appeared shortly after weed removal and few plants died unless weed cover persisted for most of the growing season. Further weed germination was allowed on some plots. Although not removed until late autumn, these weeds only had adverse effects on crop growth where initial weeding had occurred before mid-June. In one experiment, delaying weed removal until 6 July, 31 August or 2 November in the first year reduced fruit yield in the second (weed-free) year by 34%, 54% and 67% respectively. In a later experiment, competition from weeds until July or later in the first growing season gave fruit yields similar to those in the first experiment, but totally weed-free plots and those kept clean after weeding in mid-June produced less fruit than plots which remained weedy between mid-June and mid-August. It is suggested that competition from uncontrolled stolon growth in this experiment severely inhibited crown and hence truss production on plots which did not suffer weed competition. Unless left untouched until early September, weeds had less adverse effect on truss production than the stolons which they displaced. The results are interpreted in relation to improving the efficiency of weed control techniques. 相似文献
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黄杨绢野螟(Diaphania perspectalis(Walker)是园林中多种黄杨Buxus spp.的食叶害虫,暴发时可吃光叶片,甚至造成大量植株死亡。此虫体色有黑白和全黑二型。一年发生4代(局部个体一年发生1~3代),以幼虫缀合叶片成果越冬,次年春暖后恢复取食,4月下旬越冬代成虫开始出现。第1、2、3代成虫分别于6月上旬、7月下旬、9月上旬开始出现。幼虫6~8龄,有兼性滞育现象,1~3代均有部分个体滞育。与4代幼虫一起越冬。此虫各虫态有多种天敌:幼虫期育出甲腹茧蜂Chelonus sp.、绢野螟长绒茧蜂Dolichogenidea stantoni(Ashmead),蛹期育出广大腿小蜂Brachymeria lasus(Walker),并采到捕食卵粒的纹蓟马Aeolothrips sp.和多种捕食幼虫和成虫的游猎性蜘蛛(种属待查)。保护天敌对控制黄杨绢野螟的为害有重要意义。 相似文献
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Elizabeth C. Whiting Ronald W. Roncadori Bruce C. Bongarten Katherine L. Reynolds 《国际虫害防治杂志》2013,59(3):213-219
From 1989 through to and including 1994 extensive premature defoliation of black locust ( Robinia pseudoacacia L.) was observed in a progeny test plantation in Greene County, in the Georgia Piedmont. During July 1991 and 1992, all observed trees suffered greater than 50% defoliation. Leaflets of black locust showing symptoms of leaf spotting began abscising as early as mid-June following wet springs. Onset and progress of defoliation was followed on 50 trees in two plots in 1993 and 1994. In both years, sample trees were cut at the base and allowed to regrow from sprouts. A protectant fungicide, chlorothalonil (Daconil WDG 1.5 g/l water) was applied to run-off weekly to one-half of the growing sprouts beginning 17 April through 22 August 1994 by backpack sprayer. Air temperature, relative humidity, rainfall, and leaf wetness were monitored. Abscission of unprotected leaflets in 1993, a dry, hot year, began in mid-July and averaged 36% by late August; abscission of unprotected leaflets in 1994, a wet, cool year, began in mid-June and averaged 80% by late August; whereas, abscission of protected leaflets in 1994 began in late June and averaged 70% by late August. The Gompertz model described the increase of leaflet abscission with time. The estimated rate of leaflet abscission for unprotected leaflets in 1993 was significantly slower ( k = 0.056/wk) compared to the rate of abscission of unprotected leaflets in 1994 ( k =0.070/wk). Estimated rates of leaflet abscission were not significantly different between protected ( k = 0.063/wk) and unprotected trees ( k =0.070/wk) in 1994. Cumulative hours of leaf wetness of 600 h were associated with initial leaf spotting and defoliation in 1993 and in 1994. Delay in leaflet abscission of protected trees indicates that fungal infection may have contributed to premature defoliation of black locust with onset related to moisture conditions favourable for infection. 相似文献
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通过室内饲养和田间定点观察的方法,对苦参野螟(Uresiphita prunipennis)的形态及生物学特性进行了调查研究。结果表明,苦参野螟在吉林市1年发生3代,以茧蛹在枯枝落叶下或表土中越冬。每年5月中旬越冬代成虫开始羽化,幼虫分别于6月上、中旬,7月中、下旬,8月下旬至9月上旬严重为害苦参,老熟后分散于地被物下或表土层中结茧化蛹。针对苦参野螟提出了防治建议。 相似文献