Crystals may modify the food quality, reduce a plant palatability, and choice to insects, or defend against pests. Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) is considered one of the most damaging pests in field crops in the world, and is usually associated with several hosts. We examined relations between the choices of whitefly with calcium oxalate crystals (COC) presence in weeds. The treatments were weed species Amaranthus viridis L., Amaranthus viridis L., Bidens pilosa L., Chenopodium album L., Nicandra physalodes L., and Solanum americanum Mill., and, as control, Brassica oleraceae var. capitata L. B. tabaci infestation was evaluated at 7, 14, 21, and 28 days after infestation (DAI), the height and shoot dry mass at 28 DAI, and leaf blades were prepared from all treatments. B. oleraceae var. capitata, S. americanum, and B. pilosa showed greater B. tabaci infestation in this order, respectively. In the presence of COC, the reverse occurred, since in these plants there was a lower presence of COC. It is concluded that the presence of COC influences B. tabaci preference in the choice of its hosts.

晶体可能会改变食品质量，降低植物的适口性，以及对昆虫的选择，或抵御害虫。烟粉虱（Genn.）（半翅目：粉虱科）被认为是世界上大田作物中最具破坏性的害虫之一，通常与多种寄主有关。我们研究了粉虱的选择与杂草中草酸钙晶体 (COC) 的存在之间的关系。处理是杂草种类Amaranthus viridis L.、Amaranthus viridis L.、Bidens pilosa L.、Chenopodium album L.、Nicandra physalodes L. 和Solanum americanum Mill.，以及作为对照的Brassica oleraceae var. 卡塔塔 L.在侵染后 7、14、21 和 28 天 (DAI) 评估烟粉虱侵染情况，在 28 DAI 时评估高度和枝条干重，并从所有处理制备叶片。B. oleraceae变种。capita、S. americanum和B. pilosa按此顺序分别显示出更大的粉虱感染。在 COC 存在下，情况正好相反，因为在这些植物中，COC 的含量较低。得出的结论是，COC 的存在影响烟粉虱对其寄主选择的偏好。