UNIT 6. ACTIVITIES


1.-Definitions:
a.-Weed
b.-Herbicide
c.-Plant disease
2.-Classifications:
a.-Weed control methods:





b.-Types of herbicides:


c.-Plant diseases:


3.-What is the aim of weed control?
4.-Why is weed control important in agriculture?
5.-Can you name two important activities which use herbicides?
6.-What is the relationship between ecology and plant diseases?
7.-Can you name four factors that may affect plant diseases?
8.-What is the cause of infectious plant diseases?
9.-Can you name some causes of non-infectious diseases?

10.-Complete the text with 10 missing words:

crop production              unwanted         foliage           vegetation     ponds
forests         during            lakes         plant        soil         courses

A herbicide can be applied directly to the_______, applied to the_____, or sprayed onto the ________. Herbicides are applied before, ________, or after crop planting in row-crop farming to maximize ___________by diminishing the development of _________plants. Herbicides are also applied in _______ and _________ to control aquatic plants, in ________to prepare logged areas for replanting, and to golf_______, lawns, parks, and other areas to clear out unwanted ________________.

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