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在二甲砷酸进入寄主树边材后能使在树皮下的松圆头小蠹(Dendroctonus adjunctus(Hopk.))、云杉红翅小蠹(D.rufipennis)(Kirby)、黄杉小蠹(D.Pseudotsugae Hopk.)和中欧山松大小蠹(D.Ponderosae Hopk.)的幼虫和成虫致死。可在小蠹成虫迁飞前后应用二甲砷酸。用二甲砷酸在成虫迁飞前处理活的美国西部黄松(Pinus ponderosa)可用作饵木,但较之未处理的树吸引小蠹密度较小。因此这种处理不足以防治小蠹的种群。1976年在加利卜林区,在山松小蠹为害后立即用二甲砷酸处理。1977年春,从这些树中随机选择。从1.5米高处抽取19个样本,3米高处8个样本,6米高处7个样本。取样包括从
Dendroctonus adjunctus (Hopk.), D. rufipennis (Kirby) below the bark under the bark of the tree after the arsenic trioxide enters the host tree sap, Larvae and adults of D. pseudootsugae Hopk. And D. Ponderosae Hopk. Arsenic trioxide can be applied before and after the beetles migrate. Pinus ponderosa, which was treated with arsenic acid prior to migrating adults, was used as bait but attracted less density than untreated trees. Therefore, this treatment is not enough to prevent Beetles population. In 1976, in the Gallipurin district, the cinnabar mites were treated with cothenic acid immediately after the damage. Spring 1977, randomly selected from these trees. Nineteen samples were taken from a height of 1.5 meters, eight samples at a height of three meters and seven samples at a height of six meters. Sampling includes from