. Circular. Agriculture; Agriculture -- United States. 8 NEMATODE GALLWORM ON POTATOES, ETC., IN clean and healthy seed from fields where a critical inspection shows that the disease has not been present. All culled potatoes from the field should be examined, for even when disease is present the bulk of the crop may be unaffected. The gallworm does not occur in the potato-gro^^^ng districts of the Northern States, particularly North Dakota, Minnesota, Wiscon- sin, and Maine. Seed obtained originally from these States and grown on fields that are free from the gallworm should be safe t
. Circular. Agriculture; Agriculture -- United States. 8 NEMATODE GALLWORM ON POTATOES, ETC., IN clean and healthy seed from fields where a critical inspection shows that the disease has not been present. All culled potatoes from the field should be examined, for even when disease is present the bulk of the crop may be unaffected. The gallworm does not occur in the potato-gro^^^ng districts of the Northern States, particularly North Dakota, Minnesota, Wiscon- sin, and Maine. Seed obtained originally from these States and grown on fields that are free from the gallworm should be safe to use in planting other uninfested fields. Too much stress can not be laid upon the importance of securing for ])lanting potatoes which are uninfected and in planting them on uninfested land. LOCALIZATION OF INFESTED AREAS. The practical ])roblem which confronts the potato growers of Nevada is the location of all fields which are mfested with tliis parasitic nematode. The present indications are that the nematode infestation is by no means general in irrigated land. The nematode has probably existed in some of the older irrigated lands of the State for many years, but there is much new land being put under irrigation in Nevatla, which it seems probable is entirely free from this worm. If all of the infested areas can be located by a critical inspec- tion, it will be possible to produce potatoes in large quantities on uninfested land and devote the infested land to crops which are resistant to the parasite. There are probably some fields in the State which have been devoted to potatoes during the last year or two on which the parasite does not occur, and from these uninfested fields seed might be secured. It would be much safer, however, to obtain seed from the Northern States, such as Minnesota, Wisconsin, or North Dakota, with which to plant new land, rather than to risk the infestation of the new land with local seed. But it will be impossible to proceed intelligently in comb
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