1) Which of the following causes a plant disorder?
3) _________ reproduce by spores.
4) _________ reproduce by simple cell division.
5) _________ is an example of a fungal disease.
6) ________ diseases are commonly spread by aphids or leafhoppers.
7) Wilting is an example of a disease sign.
8) Infection begins when the pathogen ___________.
9) _________ move from plant to plant on in water droplets, rain splash, or being carried by insects.
10) Powdery mildew, root rots, and stem rots are examples of diseases caused by __________.
11) Leaf spots are more common during the hot, dry parts of summer.
13) A powdery mildew infection on dogwood will easily spread to zinnias or oaks in the landscape.
14) The first visible symptoms of root rot diseases usually appear as _______________.
15) The pathogens commonly associated with stem rot of ornamentals are common soil-inhabiting fungi.
16) Plants with brown stems that are shrunken at the soil line are probably infected with ________ fungi.
17) ___________ diseases often affect one side of the plant first, causing individual limbs or branches to wilt and die back.
18) Vascular wilt infections usually begin in the _______ and gradually spread internally throughout the infected plant.
19) Leaf, growing shoots, and fruit diseases are the most common types of ___________ diseases in Kentucky.
20) Mosaic diseases, characterized by light and dark blotchy patterns, usually are caused by bacteria.
21) _________ diseases usually produce pustules on plant leaves.
22) Leaf rust is rarely is an explosive problem because it develops so slowly.
23) _________ is the first step in disease management.
24) Many different plant diseases cause similar symptoms.