Breeding resistant varieties is the most cost effective method to control this rust.

They are susceptible to clubroot, so choose a resistant variety.

In addition, the suppliers didn't believe a resistant variety could be produced.

In resistant varieties, the female moves through the leaf laying only a few eggs as it goes.

While no fully resistant variety exists, resistance in the form of tolerance to the disease can be used.

The use of resistant varieties is another way some farmers control virus spread.

Corn breeding is continuing in the search for varieties resistant to the moth.

It is only recently that resistant varieties of elms have been developed.

It is best controlled through a combination of good management practices and use of resistant varieties.

There are virulent new strains, it's very important to get some good resistant varieties.