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P. R. Plant Parasitic Nematodes and Their Relationship to Crop 

 Production in Puerto Rico ! To (1) survey, identify and study 

 relationships between nematode infestation and damage on tropical 

 crops of economic importance; (2) study possibility that trees, 

 grasses, weeds, and other plant species of our endemic flora may 

 serve as reservoirs or carriers of plant parasitic nematodes; (3) 

 determine through greenhouse investigations, resistance of host 

 plants, host range of nematode species; (A) develop methods of 

 nematode control through studies of soil fumigation, crop rotation 

 and cultural practices; and (5) study effect of nematocides upon 

 our beneficial soil nematode species. 

 Ent. 88 (S-19) 



R. I. Investigations of Decline in Cultivated Plants Due to 



Associated Plant-Parasitic Nematodes , To (1) determine pre- 

 valence and severity of plant parasitic nematode infections of 

 economic crop plants in R. I.; (2) evaluate plant-pathogenic 

 effects of nematode species found associated with declining 

 cultivated plants; and (3) explore use of chemicals as repelling, 

 nematostatic, and nematocidal agents. 

 PI. Path. 605 



R. I. Biology and Control of Nematodes Associated with Plant 



Diseases, with Major Qnphasis on Ornamental and Forage Crops . (1) 

 Learn role of nematodes as inciting agents of plant disease, their 

 relationships in plant disease complexes, and their control; (2) 

 improve nematocides as contact disinfectants and chemotherapeutants. 

 PI. Path., Sit. 610 (NE-34) Coop. ARS 



S. C. Plant Parasitic Nematodes and Their Relation to Crop Production 

 in South Carolina^ To (1) survey, identify, and study significance 

 of nematode species associated with diseased or unthrifty crops; (2) 

 isolate and maintain soil cultures of more important parasitic 

 nematode species for use in further studies; (3) determine, through 

 greenhouse work, host range of specific nematodes on important crops 

 and weeds, so as to identify resistant or non-host plants to be used 

 in further field rotation trials; (A) study influence of specific 

 nematodes on increased severity of plant diseases primarily attrib- 

 uted to other causes; and (5) develop methods of nematode control 

 through studies on crop rotations; cultural practices, and soil 

 fumigation, alone or in combinations. 

 Bot., & Bact. 55 (S-19) Coop. ARS 



Tenn. The Utilization of Soil Fumlgants. and Control of Certain 



Diseases Incited by Nematodes . To (1) determine most effective 

 means of nematode control under Tennessee conditions using fumigants 

 and other nematocides; (2) seed control of certain nematode incited 

 diseases; and (3) determine possible deleterious results from soil 

 treatments for nematodes. 

 PI. Path. 138 (S-19) 



