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提出了毛竹尖胸沫蝉林间虫情调查的最适取样数的确定方法,采用期距法进行该虫发生期中、短期预报;提出查5龄若虫的虫口密度预测来年低龄若虫的虫口基数,为该虫的预测预报提出了科学的方法。 相似文献
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To clarify the infection approach of Diplodia sapinea, a pathogen that causes tip blight of Pinus tabulaeformis, the infection process of the pathogen in needles was observed using scanning electron microscopy (SEM). In addition, the disease incidence on branches damaged by Aphrophora flavipes (Hemiptera: Cercopidae) and Dioryctria splendidella (Lepidoptera: Pyralidae) in the forest was also investigated. Then, branches and needles of P. tabulaeformis were inoculated using the D. sapinea spore suspension under indoor and field conditions. The results showed that the damage caused by A. flavipes could aggravate the occurrence of tip blight of P. tabulaeformis to some extent. Moreover, the pathogen could also penetrate 1‐, 2‐ and 3‐year‐old pine needles through stomata in the field. The pathogen infected the 1‐year‐old branches first and then gradually spread to 2‐ and 3‐year‐old branches. 相似文献
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竹尖胸沫蝉林间防治研究 总被引:2,自引:1,他引:2
应用 40 %氧化乐果乳油、80 %敌敌畏乳油、2 5 %敌杀死乳油等药剂进行不同施药方式、不同用药浓度的林间防治试验 ,结果表明 ,40 %氧化乐果乳油 1∶5倍液进行注射效果最好 相似文献
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在被害本根径上部 20 cm处沿树干均匀打 4个孔,孔与树干成 45°角,每孔注射氧化乐果的稀释液2ml。氧化乐果的稀释液有三种,分别为1:1、1:5、1:10。试验结果表明,1:10的氧化乐果稀释液防治效果达87.24%,且成本低,在生产中宜推广。 相似文献
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毛竹尖胸沫蝉危害对毛竹枝叶黄酮和单宁含量的影响 总被引:9,自引:2,他引:9
毛竹尖胸沫蝉是近年出现的一种毛竹枝梢新害虫,经对毛竹受害与未受害枝、叶的黄酮、单宁含量测定,结果表明:该虫对新梢的刺吸危害可极显著地增加受害枝条受害枝梢新叶(A)和受害枝条未受害枝梢新叶(B)的黄酮含量,每克干物质的黄酮含量比对照[未受害枝条未受害枝梢新叶(CK)]分别增加1.9906mg和2.2756mg;但受害枝条受害枝梢(D)和受害枝条未受害枝梢(E)的黄酮含量却极显著地减少,每克干物质的黄酮含量比对照分别减少1.2381mg和1.1579mg。与黄酮相同,该虫的危害也能极显著地增加受害梢新叶和受害枝条未受害枝梢新叶的单宁含量,每克干物质的单宁含量比对照分别增加0.4291mg和3.1981mg;也极显著地减少受害枝条受害枝梢和受害枝条未受害枝梢的单宁含量,每克干物质的单宁含量比对照分别减少3.6274mg和5.160omg。毛竹枝叶受害引起这些次生物质含量的显著变化可能与诱导抗虫性有关,且这种诱导作用可在相邻枝梢及叶间传递。 相似文献