The part of the sentence 'varieties of crops' is correct and usable in written English.
You can use it to describe the different kinds of crops that are grown. For example, "The farmer grew a wide range of varieties of crops, including potatoes, corn, and wheat."
In fact, these plant pests sometimes limit the kinds and varieties of crops that can be grown.
From ensuring that cosmetics and medications are safe, to developing the varieties of crops we are familiar with, scientists are vital.
"We have to ask what can we do to develop better varieties of crops, animal species and management practices because this is the situation we've got".
To contaminate traditional varieties of crops is to contaminate the genetic reservoir of plants on which humanity has depended for most of its history.
Smaller farms are often better able to save seeds and develop new varieties of crops that are adaptable to changing weather and climate.
It is one of several new initiatives to develop improved varieties of crops that have been grown by small-scale farmers for generations but long-overlooked by international researchers and industry focused on globally traded staples like wheat and maize.
Most available commercial varieties of crop plants bear resistance to at least one, and often several, pathogens.
This is because seed banks rarely store varieties of crop that do not produce seeds, including cassava, bananas and many other fruits and berries.
So it is implacable to either search for salinity resistant varieties of crop plants or transform them genetically to sustain growth and reproducibility at increasing salinity stress.
The large variety of crops grown include tobacco, fruits, and hazelnuts.
A variety of crops are grown in the rural areas, and fishing and forestry are also important.
