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Minn. Nematodes in Relation to Plant Diseases , Learn number of species 

 of nematodes attacking cultivated crops and wild plants and their 

 relative prevalence and distribution. Study host range of a given 

 species, factors influencing their persistence, and multiplication; 

 parasitic capabilities alone and in association with bacteria and 

 fungi; their role as predisposing agents in winter injury to winter 

 annuals and perennials; methods of control — chemicals; crop sequences, 

 and varietal resistance. 

 PI. Path., Bot. 2228 



Mo. Nematodes of Missouri and Their Relation j > the Agriculture of 



the State . Learn kinds, prevalence, and importance of nematodes in 

 relation to crop production. Test promising chemical and physical 

 methods for their control. Study relation between types of organic 

 materials in soil and nematode injury to crops, and influence of 

 soil types and previous cropping history on nematode abundance. 

 Select crop varieties showing tolerance or resistance to nematode 

 injury and learn susceptibility of other host plants to nematodea. 

 By experiment, show usually unrecognized losses due to nematodes. 

 Ent. 312 



Nebr. Nematode Disease of Plants in Nebraska and Their Control . To 



(1) ascertain identity and distribution of plant parasitic nematodes; 



(2) seek new and more practical controls; (3) develop new techniques 

 for nematological research; (4) evaluate effects of nutrition and 

 other factors on nematode diseases; (5) determine interrelationship 

 of nematode with other organisms in causing diseases; and (6) study 

 means of dissemination of nematodes especially under irrigated 

 conditions • 



PI. Path. 479 Coop. ARS 



Nebr. Investigations of Nutrition and Physiology of Nematode Diseases 

 Through the Use of Plant Tissue Culture d Learn (1) nematodes and 

 host combinations best fitted for tissue culture investigations; (2) 

 methods for disinfestation of parasites and hosts; (3) effects of 

 various conditions on hosts and nematodes; (4) effects of various 

 conditions on disease complexes involving host, nematode, and other 

 organisms. 



Pl.Path. 565 (NC-39) Coop. ARS 



N. J. Population Changes Among Plant Parasitic Nematodes Associated with 

 Food and Forage Crops in New Jersey . (1) Study changes in population 

 of parasitic nematodes seriously affecting several different crops in 

 State; (2) correlate their numbers with temperature, soil moisture, 

 crop growth, 'and presence of saprophytic and predaceous nematodes. 

 Eht. PI. Path. 209 (NE-34) Coop. ARS 



