“锈病”造句

果园不应设立在锈病率发生高的地区.
Orchards should not be established in areas with high rust - incidence.

茎锈病会使枝干衰弱.
Stem - rusts weaken branches and stems.

简述我国小麦条锈病大区流行规律.
Please analyse the conditions of disease development of wheat scab.