共查询到19条相似文献，搜索用时 156 毫秒
1.
采用排除法，分析桔园中两种主要天敌对桔全爪螨的控制作用。试验表明，在一定益害数量比例条件下，尼氏钝绥螨或深点食螨瓢虫，均可在短期内发挥控制作用，将桔全爪螨种群数量控制在较低的密度。当尼氏钝绥螨：桔全爪螨为１：２０时，１个月后猎物密度从２６头／叶降至１头／叶以下，而对照中则保持在２０头／叶。当深点食螨瓢虫：桔全爪螨为１：２５时，１个月后猎物数量从２９头／叶下降至９．５头／叶。两种天敌共同作用时，猎物 相似文献
2.
3.
4.
广西食螨瓢虫初步观察 总被引：1，自引：0，他引：1
在宜昌柑桔产区,广西食螨瓢虫 Stethorus(Parasthorus)guangxiensis pargxiensis pang et Mao 1978年普遍发现,并逐步上升为桔全爪螨paraetranychus citriMcg.捕食性天敌的优势种。这种现象可能同1977年1月这里的柑桔受到大冻,在恢复树势的过程中,减少了药剂防治这一事实有关。一、生活史广西食螨瓢虫多以成虫少数为蛹在柑桔树冠下部的叶背越冬。晚秋期间桔全爪螨发生严重的那些植株上,蛹的越冬比例增大。 2月下旬,越冬成虫开始产卵;3月中旬,幼虫孵出;4月初,始蛹;4月中旬,出现第一代成虫。年末一代于11月中旬盛卵,延续到12月上旬。旬均温18。～20.2℃ 相似文献
5.
湖南桔园主要天敌对柑桔全爪螨的捕食作用及其综合评定 总被引：1，自引：0，他引：1
1984-1988年调查了湖南桔园主要天敌——尼氏钝绥螨、深点食螨瓢虫、塔六点蓟马、中华草蛉、龟纹瓢虫的田间消长动态,测定了它们对柑桔全爪螨的捕食功能反应,均属于Holling Ⅱ型。5种主要天敌中,尼氏钝绥螨发生量最多,与柑桔全爪螨数量相关极为显著:中华草蛉的日捕食量最大,对柑桔全爪螨处置时间最短;深点食螨瓢虫食性较专一,对柑桔全爪螨瞬时攻击率最高。根据每种天敌的发生量、发生期、捕食能力及抗药性等4个因素,应用模糊分级方法综合评定对柑桔全爪螨控制作用大小依次为:尼氏钝绥螨、深点食螨瓢虫、塔六点蓟马、中华草蛉、龟纹瓢虫。这些天敌的综合作用可以控制正常年份柑桔全爪螨的为害。 相似文献
6.
7.
武胜县园艺场种植柑桔1036亩,主要受柑桔全爪螨(红蜘蛛)Panonychus citri McG-regor、六斑始叶螨(黄蜘蛛)Eotetranychus sexmaculatus Riley、锈壁虱(柑桔瘿螨)Phyllocoptes oleivorus Aahmead等为害。控制害螨的天敌有长须螨、钝绥螨、巨须螨、食螨瓢虫、草蛉、六点蓟马、瘿蚊等,以长须螨Agistemns exsertus群体较稳定。 相似文献
8.
报道了生防园和常规化学防治园中桔全爪螨及其主要天敌的种群数量动态。在春季助迁尼氏钝绥螨补充自然天敌数量的不足，结合其他天敌的作用，使试验期间生防园桔全爪螨种群数量得到控制，而在常规化学防治园中，桔全爪螨密度的大大高于生防园。 相似文献
9.
金霸螨等5种杀螨剂对桔全爪螨防效表明：贵州独山柑桔产区桔全爪螨对金霸螨(2500倍)和金霸螨加氧化乐果(3000倍 1000倍)较为敏感，药后l～14d田间防效均在90％以上。三氯杀螨醇可作为桔全爪螨防治中的轮换用药． 相似文献
10.
本文详细地研究了桔全爪螨 Panonychus citri 与其天敌尼氏钝绥螨(以下简称尼氏螨)A.nicholsi 之间的数量关系(包括功能反应和数值反应)。主要结果如下:1.尼氏螨对桔全爪螨的瞬时攻击率在其孵化后第五天达到最大值。其功能反应更接近于Holling Ⅰ型。2.当桔全爪螨的密度为每 Munger 小室内9头时,尼氏螨的产卵量和内禀增殖率是最大的。3.当尼氏螨仅靠捕食桔全爪螨来维持生命时,其寿命和产卵量远远低于它取食花粉时的情况。 相似文献
12.
13.
柑桔红蜘蛛为柑桔主要害虫之一,据在广东(?)平地区观察,此虫虫口消长与树令,夏、秋梢,有一定的关系,一般结果树受害轻;幼苗受害严重。每当夏、秋梢老熟时,正值红蜘蛛出现高峯。该虫完成一世代的历期,与温度有关:2—5月,完成一世代的历期31—41天;6—10月,历期20.25—27.00天。每头雌成虫产卵7—113粒。药剂防治以600—800倍20% T.D.N 效果最好;2,000—6,000倍乙基1059次之;0.4°波美的石硫合剂、0.4°波美的多硫化钡等残效期较短。 相似文献
14.
The feasibility of controlling the two-spotted spider mite in apple orchards by inundative releases of the phytoseiid predatorPhytoseiulus persimilis, was studied in a field trial in northern Israel. Half a million predators released per acre, maintained high populations
forca 2 months until the spider mite population dropped below the economic threshold.P. persimilis demonstrated a dispersal capacity of at least 90 m from its original release site. The ability of the predator to switch
to alternative prey (the European red mite) and the economic feasibility of this non-chemical approach to spider mite control,
are discussed. 相似文献
15.
Spirodiclofen and spirotetramat bioassays for monitoring resistance in citrus red mite, Panonychus citri (Acari: Tetranychidae) 总被引：3，自引：0，他引：3
BACKGROUND: Citrus red mite, Panonychus citri (McGregor), is a key pest of San Joaquin Valley California citrus. Spirodiclofen was registered for mite control in 2007, and spirotetramat for scale control in 2008. Because of the potential for resistance to spirodiclofen to develop in spider mites, and cross‐resistance to spirotetramat used for other citrus pests, bioassay methods for resistance monitoring were developed. RESULTS: The responses of four populations of adult female, egg and larval stages of P. citri to spirodiclofen were compared to determine the most robust bioassay method for this pesticide. Adult females responded with a higher LC99 and larval stages exhibited higher control mortality and a lower slope of response compared with the egg stage. Thus, the egg stage was found to be the most suitable stage for testing. Egg production and egg shape were significantly affected by spirodiclofen treatment of adult female mites. Bioassays with the related compound spirotetramat revealed that P. citri egg hatch was less affected by this compound, requiring the assessment of mortality to be extended to 11 days after treatment when the hatched larvae succumbed to the pesticide. Discriminating concentrations of 10 ppm for spirodiclofen and 31.6 ppm for spirotetramat in an 11 day bioassay were tested against eight field populations of P. citri, and 99–100% mortality resulted. CONCLUSION: These results provide a baseline for the response of P. citri to spirodiclofen and spirotetramat that will aid resistance management in California citrus. Copyright © 2011 Society of Chemical Industry 相似文献
16.
BACKGROUND: The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is a cosmopolitan insect pest of citrus and vectors the bacterium Candidatus Liberibacter asiaticus, a suspected causal organism of citrus greening or ‘huanglongbing’ disease. Aldicarb 150 g kg?1 GR (Temik® 15 G) was evaluated at three rates, two placements and three timings for ACP control in orange trees. RESULTS: Application of aldicarb at 5.6, 2.8 and 1.4 kg AI ha?1 in March 2006 reduced adults by 58–66%, 45–46% and 25–37% respectively compared with untreated controls in two separate trials. No difference was observed in placement (one versus two sides of the tree) or tree size (8 years old versus 12 years old). Application at 5.6 kg ha?1 in January 2007 reduced adults by 86% and shoot infestation by 77% in spring, and was generally better than the November and especially February applications. Even more striking results were evident on adults caged on treated plants for 25 days in March. Spiders and ladybeetles were equally abundant in treated and untreated trees. CONCLUSION: Aldicarb application at 5.6 kg ha?1 to the bed side of mature citrus trees 2–3 months before spring growth can suppress ACP through spring without a direct effect on principal psyllid natural enemies. Copyright © 2008 Society of Chemical Industry 相似文献
17.
A new phytophagous mite species, Panonychus citri (McGregor) (Acari: Tetranychidae) (the citrus red mite), was found in Cyprus during spring 2008, infesting citrus plantations.
Mites occurred in large numbers, mainly in the canopy of orange, lemon and mandarin trees. The adults and larvae preferred
the upper surfaces of mature leaves of the above citrus species, although they occurred on both leaf surfaces. Orange, lemon
and mandarin trees were greatly affected by this mite, as its high population densities under hot and dry conditions in the
spring caused heavy leaf drop (firing) and twig dieback. 相似文献
18.
Yueping Yang Mingdu Huang G Andrew C. Beattie Yulu Xia Gecheng Ouyang Jinjun Xiong 《国际虫害防治杂志》2013,59(4):343-352
Abstract The Asiatic citrus psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is a major pest of citrus in China. Its status derives, not from the damage it causes, but from its role as the only known vector in China of huanglongbing, a phloem-limited bacterial disease of international importance. The disease can devastate orchards within a few years of planting. It also poses a major threat to endangered indigenous citrus germplasm in Asia and Australasia. The distribution, biology, ecology and control of the psyllid in China are reviewed in these contexts. Constraints and challenges related to control of the vector in China are discussed. 相似文献
19.
在苹果园果树行间种植覆盖作物——白花草木樨Melilotus albus Desr.是果园土壤管理制度中的一项措施。它影响到苹果树上捕食性天敌群落的组成。种植覆盖作物后,一些天敌,如拟长毛钝绥螨Amblyseius pseudolongispinosus Xin et Lian和中华草蛉Chrysopa sinica Tjeder等在苹果树上捕食性天敌群落中的个体数量相对百分比有所增加;而另一些,如小花蝽Orius minutus(Linnaeus)、塔六点蓟马Scolothrips takahashii Priesaer和瓢虫类(Coccinellidae)等天敌有所减少;还有一些天敌,由于发生数量较少,不易与免耕法对照区进行比较。当使用广谱性化学杀虫剂进行树上喷雾时,覆盖作物对于受到化学杀虫剂干扰的苹果树上小花蝽O.minutus(Linnaeus)种群的恢复与建立有着促进作用。 相似文献