西双版纳棚栽辣木主要害虫及防治

介绍了西双版纳棚栽辣木存在的主要害虫:朱砂叶螨(Tetranychus cinnabarinus Boisduval)、美洲斑潜蝇(Liriomyza sativae Blanchard)、斜纹夜蛾(Prodenia litura Fabricius)和小菜蛾(Plutella xylostella L.)为害症状和防治。     

云南省辣木害虫及天敌种类调查

为明确云南省辣木主要害虫及天敌种类,给害虫防治和天敌利用提供参考,2013-2014年对云南省辣木种植区的辣木害虫及天敌进行了调查。经鉴定,调查采集到的辣木害虫隶属4纲、33科、45个种,主要害虫为辣木瑙螟、斜纹夜蛾、小菜蛾、柑橘蚜虫、二斑叶螨、美洲斑潜蝇等;天敌隶属2纲、7目(蜘蛛归为一个目)、7科、19个种,主要天敌为蜘蛛和瓢虫。辣木瑙螟、斜纹夜蛾、小菜蛾、柑橘蚜虫、二斑叶螨、美洲斑潜蝇等种类发生较普遍,在调查点均有发现。尺蠖、菜粉蝶、根粉蚧等害虫危害相对严重,但分别只在四川米易、玉溪易门和本所发现,锈斑白条天牛只在本所和德宏热作所发现。     

危害辣木的重要害虫——赤斑白条天牛

通过田间调查和室内饲养观察,描述赤斑白条天牛Batocera rufomaculata (Degeer)的形态特征,摸清其在云南省辣木Moringa spp.种植区的发生规律、危害特征。通过调查结合文献资料明确赤斑白条天牛的分布范围和寄主植物,提出了防治建议。     

双条杉天牛试验研究工作小结

双条杉天牛(Semanotus bifasciatus Motschulsky)系属鞘翅目、天牛科、天牛亚科,为害杉木、柳杉及松柏类树木,是杉木的一种毁灭性的主要蛀干害虫,普遍发生于杉木人工林。此虫分布在我省各地,从幼虫危害杉木的韧皮部和木质部边材,蛀成圆扁形弯曲不规则的虫道,     

马蹄筋草坪害虫夜蛾的防治

斜纹夜蛾属鳞翅目、夜蛾科，分布于我国１０多个省市。斜纹夜蛾食性很杂，可危害９９科２９０多种植物，是草坪、花卉及园林植物的常见害虫。发生特点与危害特征斜纹夜蛾在长江中下游地区，一年可发生５代。但近几年来受厄尔尼诺现象的影响，冬季１１～１２月份，在南京城...     

油茶苗圃地新害虫——斜纹夜蛾

斜纹夜蛾Spodoptera litura(Fabricius)是世界性分布的杂食性农业害虫,具有寄主植物种类多、繁殖潜力大、适应能力强、迁移距离远等特点,极易造成短期内暴发成灾[1]。据秦厚国等整理出的斜纹夜蛾寄主植物名录,     

桦树星天牛幼虫种群空间分布格局分析

应用聚集度指标法、回归分析法、马占山"重新解释的Taylor幂法则"对危害桦树的星天牛幼虫种群空间分布格局进行研究。结果表明,星天牛幼虫在桦树林内呈聚集型分布状态,分布的基本成分为个体群,个体之间相互吸引又保持一定的排斥距离;用马占山关于"重新解释的Taylor幂法则"分析得出,星天牛幼虫的种群类型归属于"聚集度逆密度制约型"。根据聚集度指标确定理论抽样数,并估计种群密度。     

杨树云斑白条天牛的危害特点及空间分布

以危害杨树的云斑白条天牛种群为调查对象,对其危害特点与空间分布进行调查研究。结果表明,云斑白条天牛的危害程度与杨树的树龄、胸径均呈抛物线式相关,危害程度随树龄、胸径的增大先上升后下降,4~8年生树龄、12.0~21.9cm胸径的杨树受害最严重;不同林地环境下的杨树受害程度也不一样,渠道林受害最重,村庄林和道路林次之,片林较轻。通过频次比较法分析表明,危害杨树的云斑白条天牛幼虫的空间分布型符合负二项分布,为聚集分布。     

江西北美栎树害虫及其天敌种类初步调查

调查北美栎树害虫及其天敌昆虫发生种类,为北美栎树害虫的预测预报及可持续防控提供科学依据.采用踏查和样地调查相结合的方法,调查了江西省北美栎树害虫及其天敌昆虫种类.结果表明,北美栎树害虫有88种,隶属于节肢动物门2纲6目41科.为害严重的害虫以栎奥象、栗大蚜、星天牛和云斑白条天牛为主,前三者主要为害苗期,后者主要为害成林期.天敌昆虫有22种,主要天敌昆虫是二星瓢虫、异色瓢虫、聚纹双刺猛蚁、黑蚂蚁.     

苹果绵蚜的生物学特性及无公害防治技术

苹果绵蚜又叫蚜虫、赤蚜、血蚜，是苹果树的危险性害虫，主要为害苹果属，还为害梨属、山楂属、花楸属、李属、桑属、榆属等植物。该虫繁殖快，为害重，难防治，是国内外重要的检疫对象。沧州市自1999年发现苹果绵蚜以来，发生范围逐渐扩大，呈零星分布。     

西双版纳辣木常见病虫害及其防治

简述辣木田间常见的落叶病、嫩梢萎蔫病、枝条溃疡病、豆荚褐腐病,以及夜蛾、小菜蛾、红蜘蛛、蚜虫等害虫的发生规律和防治方法。     

斜纹夜蛾对森林苗木的危害状及防治措施初报

斜纹夜蛾是一种杂食性害虫,在森林苗圃中暴发成灾,在掌握其危害苗木规律及其生活习性的基础上,提出相应的防治措施。     

2种梨茎蜂初步观察

梨茎蜂是发生在甘肃天水梨树上的主要害虫之一,近年在天水各梨产区严重发生。目前在天水市为害梨树的茎蜂虫种有古氏简脉茎蜂和梨筒脉茎蜂2种。古氏简脉茎蜂在天水1年1代,以老熟幼虫在当年生被害枝内做茧越冬;梨简脉茎蜂在天水2年1代,以老熟幼虫在2年生或多年生被害枝内结茧越冬。幼虫期防治主要采用人工防治与生物防治相结合方法,成虫期则在羽化盛期施药防治。     

Insect antifeedant and growth regulating activities of salannobutyrolactone and desacetylsalannobutyrolactone

Salannobutyrolactone and its deacetylderivative were tested for insect antifeedant and growth regulatory activities against the tobacco cutworm, Spodoptera litura. Salannobutyrolactone was the most effective antifeedant. Desacetylsalannobutyrolactone increased larval duration and larval mortality.     

苦楝果乙醇粗提物对斜纹夜蛾幼虫取食行为的影响

探讨了苦楝Melia azadarach果的乙醇粗提物对斜纹夜蛾Spodoptera litura 5龄幼虫取食行为的影响。结果表明,经苦楝果乙醇粗提物处理后的斜纹夜蛾5龄幼虫,其10h内发生的取食活动和取食问间隔的次数减少,平均每次取食活动和取食时间间隔持续的时间延长;在每次取食活动中,用于取食的时间明显减少,这反映苦楝果乙醇粗提物能显著影响斜纹夜蛾的取食行为。     

Polyphagous caterpillars of Spodoptera litura switch from a trap crop to the main crop,improve fitness,and shorten generation time

Journal of Pest Science - Trap crops are used for pulling the pest load from the main crops toward themselves. Here, we report a switching by a polyphagous pest, Spodoptera litura, from trap crop...     

Adaptations of Plutella xylostella adult females and larvae to waxy host plants

Journal of Pest Science - The diamondback moth (DBM), Plutella xylostella, is an oligophagous pest of cruciferous crops worldwide. Host plants of the DBM possess epicuticular wax, but thick wax is...     

Insecticidal activity of essential oils to the tobacco cutworm, Spodoptera litura

Twenty-one essential oils were tested for insecticidal activity via topical administration to third instar larvae of the tobacco cutworm, Spodoptera litura. Oils of Satureia hortensis, Thymus serpyllum and Origanum creticum produced >90% larval mortality at 24 h at a dose of 100 microg per larva. The LD(50) value for S. hortensis (48.4 microg) was comparable to that for Thymus vulgaris (46.9 microg). The monoterpenoid phenols thymol and carvacrol, major constituents of the oils of Thymus and Satureia species, likely account for the insecticidal action of the species.     

Effect of ivermectin on larval mortality and reproductive potential of <Emphasis Type="Italic">Albizia</Emphasis> foliage feeder, <Emphasis Type="Italic">Spirama retorta</Emphasis> Cramer (Lepidoptera: Noctuidae)

Toxicity of ivermectin (Ivecop-12), a derivative of avermectin B, produced by a soil actinomycete, Streptomyces avermitilis, was evaluated in laboratory against the larvae of Spirama retorta Cramer (Lepidoptera: Noctuidae), a major stenophagous insect defoliator of Albizia spp. (family Leguminosae) in nurseries and young plantations. The study was conducted with eight treatment concentrations of lethal and sub-lethal doses. Results revealed that ivermectin is highly toxic and induce larval mortality when applied separately on host plant leaves and larvae, and on leaves and larvae of the insect pest together. The nature of treatment affects the larval mortality. Treatment of host plant leaves alone as well as leaves together with larvae showed 100% mortality by the treatment of 0.075% concentration whereas only 95% larval mortality was recorded due to larval treatment by the concentration of 1.2%. The LC₅₀ value of the tested product was worked out to be 0.014, 0.170 and 0.012% for leaf and larval treatments separately and leaf and larval treatments together, respectively, against the insect pest. This clearly shows that ivermectin is more effective in larval killing when ingested through food. Further, the adults developed from treatments of sub-lethal concentrations and subsequently, when mated laid significantly (P < 0.05–0.01) less number of eggs and also showed significant (P < 0.05–0.01) reduction in hatching percentage compared to control. These observations suggest that the tested bioproduct, ivermectin, interfere physiological programming of larvae thereby causing alteration in fecundity and fertility of the target insect pest.