探索连作对嘉菊植株构件、抗病虫能力和产量的影响。对山东省嘉祥县连作和非连作地种植的嘉菊根、茎、叶、花各构件、病虫害发生及产量进行调查研究。结果表明,(1)连作对嘉菊植物构件有显著影响,整株变矮,主干变细,冠幅与叶面积减小,各级分枝数及直径变细,长度5 cm以上侧根数减少;(2)连作嘉菊抗病力减弱但未达显著水平,蛴螬为害致缺苗断垄数增加,差异未达显著水平;(3)连作嘉菊花蕾数减少,百蕾重减轻,产量明显下降。结论:连作对嘉菊植物构件产生显著影响,是导致减产的主要原因,病虫害发生强化了连作的负面效应。 Effects of continuous cropping on plant components, pest resistance and pest resistance and yield of. Investigations were made on the components, pests, diseases and pests of A. jacaranda, stem, leaf and flower planted in continuous and non-continuous planting in Jiaxiang County of Shandong Province. The results showed that: (1) Continuous cropping had significant effects on the plant components of Argiopenea, the whole plant became shorter, the trunk became thinner, the crown and leaf area decreased, the number of branches and diameters at all levels became smaller, and the number of lateral roots longer than 5 cm ; (2) even for the chrysanthemum and chrysanthemum weakened but did not reach a significant level of disease resistance, 蛴 螬 damage caused by lack of seedlings broken ridge number increased, the difference was not significant; (3) decline. CONCLUSION: Continuous cropping has a significant effect on the plant components of Agkistrodon yumi, which is the main reason for yield reduction. The occurrence of pests and diseases strengthens the negative effect of continuous cropping.