Unmanaged, foliar diseases of nursery stock can be detrimental to woody plant biology and aesthetics. Build-up of disease resistance due to an over-reliance on synthetic fungicides means alternative disease management strategies are now recommended. The purpose of these studies was to investigate the effectiveness of three resistance inducers, harpin protein, salicylic acid derivative and chitosan that are commercially available to growers. Resistance inducers were applied alone and in combination with a synthetic fungicide (penconazole or boscalid + pyraclostrobin) against three foliar diseases (Venturia inaequalis, Guignardia aesculi, Diplocarpon rosae) using container grown stock. Nine experiments were conducted over five consecutive years. The use of a resistance inducer alone significantly reduced disease severity in six of the nine experiments. In eight of the nine experiments application of penconazole or boscalid + pyraclostrobin at 0.66 cc and 0.6 g l⁻¹ i.e. two third manufacturers recommended rate in combination with a resistance inducer provided the same degree of disease control as penconazole or boscalid + pyraclostrobin applied at the manufacturers recommended rate of 1.0 cc and 0.9 g l⁻¹. Similarly, efficacy of a penconazole or boscalid + pyraclostrobin at 1.0 cc and 0.9 g l⁻¹ + respectively + resistance inducer was greater than that of a penconazole or boscalid + pyraclostrobin at 1.0 cc and 0.9 g l⁻¹ alone. Results conclude that combinations of a resistance inducer with a reduced dose of a synthetic fungicide are as effective as a fungicide applied at full strength, provided a minimum of four sprays are applied over a growing season, at reducing symptom severity of V. inaequalis, G.aesculi and, D. rosae.

苗木的未治理叶面疾病可能有害于木本植物生物学和美学。由于过度依赖合成杀真菌剂而导致的抗病性增强，这意味着现在建议采用替代性疾病管理策略。这些研究的目的是研究三种抗性诱导剂，harpin蛋白，水杨酸衍生物和脱乙酰壳多糖的有效性，这些诱导剂可从种植者处购得。抗药性诱导剂可单独使用，也可与合成杀真菌剂（penconazole或boscalid +吡咯菌酯）联合使用，以对抗三种叶面疾病（无头Venturia，七叶树，Diplocarpon rosae））使用容器种植的牲畜。连续五年进行了九次实验。在九个实验中的六个实验中，单独使用抗性诱导剂可显着降低疾病严重程度。在九个实验中的八个实验中，在0.66 cc和0.6 gl ^-1的喷药中应用戊康唑或boscalid +吡菌胺酯，即三分之二的制造商推荐的速率与耐药诱导剂联合使用，以提供与制造商使用的戊康唑或boscalid +吡菌胺酯相同的疾病控制程度推荐速率为1.0 cc和0.9 gl ^-1。类似地，在1.0 cc和0.9 g l ^-1时，戊康唑或boscalid +吡菌胺酯的功效 +分别为1.0 cc和0.9 g l ^-1时+的抗性诱导剂大于Penconazole或boscalid +的唑菌胺酯。结果得出这样的结论与合成的杀真菌剂的剂量减少的电阻诱导物组合是一样有效施加在全强度的杀真菌剂，提供了一种最少四个喷雾剂施加在生长季节，在减少的症状严重程度苹果黑星菌，ģ .aesculi和D. rosae。