Plant doctor quiz (3)

Welcome to the plant doctor quiz (3). 
This is the third in a series of quizzes for plant doctors and others.  If you tried the previous quiz please use the same name as before.  Have a go at the questions they are designed to assess and educate!
Please tell us who you are  (This does not have to be your real name BUT please use the same name each time you do a quiz, don't put your email address if you would prefer not to)

Question Title

* 1. Address