Castagnoli M, Simoni S, Panconesi A, Failla O
Istituto Sperimentale per la Zoologia Agraria, via Lanciola 12/a, Cascine del Riccio, 50125 Firenze, Italy.
Exp Appl Acarol. 2002;26(3-4):195-207. doi: 10.1023/a:1021126401106.
In Italian nurseries and young groves of evergreen cypress (Cupressus sempervirens L.), the eriophyoid mite Trisetacus juniperinus (Nal.) is considered a very serious pest. A rating system of damage symptoms was developed to investigate the susceptibility of different cypress seedling families to the mite. Based on this system, the seedlings were evaluated for three years in the nursery and in two field locations after transplanting. Data obtained in the nursery allowed the cypress families to be allocated to at least two different levels of susceptibility. These levels of susceptibility were generally also maintained in the field. However, the environmental conditions of the two transplanting localities significantly affected the susceptibility of each family. In all families, scores for each of the damage categories were strongly correlated positively to each other and negatively with the average increment in the height of plant over the duration of the field experiment. Assessment of the intensity of the symptoms peculiar to damage category A (buds enlarged, deformed, russet and/or branch apex folded) was sufficient to give the same susceptibility evaluation as if data for all damage categories were used. The evaluation of susceptibility on the basis of injury pattern may return very useful information for selection and certification of families of known susceptibility to eriophyoid mites.
在意大利的常绿柏树（刺柏）苗圃和幼林中，瘿螨属的桧瘿螨被视为一种非常严重的害虫。为研究不同柏树幼苗家系对该螨的易感性，制定了一套危害症状评级系统。基于此系统，在苗圃中对幼苗进行了三年评估，并在移栽后于两个田间地点进行了评估。在苗圃中获得的数据可将柏树家系至少分为两个不同的易感性等级。这些易感性等级在田间通常也得以保持。然而，两个移栽地点的环境条件显著影响了每个家系的易感性。在所有家系中，每个危害类别的评分彼此之间呈强正相关，并且与田间试验期间植株高度的平均增长量呈负相关。对危害类别A（芽肿大、变形、赤褐色和/或枝尖折叠）特有的症状强度进行评估，足以给出与使用所有危害类别数据时相同的易感性评估结果。基于损伤模式进行易感性评估，可能会为选择和鉴定已知对瘿螨易感的家系提供非常有用的信息。
