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Tex, Plant Parasitic Nematodes in Texas , To (l) determine, isolate 

 and maintain in pure populations, nematodes suspected of causing 

 crop losses in Texas; (2) attempt to relate soil nematode populations 

 qualitatively and quantitatively to soil types and land management 

 history; (3) determine possible roles of nematodes in crop losses by 

 experiments involving controlled infestations of pure populations of 

 nematodes alone and in combination with selected fungi associated with 

 a disease complex; and (4) investigate control of plant parasitic 

 nematodes by chemical means, crop rotation, and selecting resistant 

 strains of commercial crops, 



PI. Physiol. 944 (S-19) Coop, ARS 



Va, Susceptibility of Codling Moth to DDT and to a New Nematode 



Disease , (1) Learn extent of codling moth resistance to DDT in 

 apple orchards in northern Virginia, and the order of such resistance; 



(2) compare characteristics of resistant and non-resistant strains; 



(3) improve control of resistant strains by insecticides and by 

 disseminating a new nematode disease of the larvae. 



Bit, 86005 



Va, The Relationship of Nematodes to Plant Diseases in Virginia , 



To (l) determine the identity, distribution, and significance of 

 nematodes associated with diseased plants; (2) determine type and 

 extent of injury caused by nematodes alone and in combination 

 with other microorganisms; (3) develop nematode control measures, 

 PI. Path. & Physiol. 93904 (S-19) 



W. Va. Biology and Control of Nematodes Affecting Fruit Trees and 

 Forest Tree Seedlings . (1) Learn effect of nematodes on growth 

 and productivity of young fruit trees; nature of parasitism of 

 ectc— parasitic nematodes on roots; deciduous fruit tree host range 

 of parasitic nematodes found in State, and suitable nurse crops for 

 rearing cultures of nematodes; measures suitable for commercial 

 control of nematodes on young trees; extent that toxic materials 

 are absorbed and translocated, and if this causes off- flavor; (2) 

 learn role of nematodes in lack of productivity and early decline 

 of established plantings of fruit trees, and failure of replant 

 trees to thrive; occurrence and relative importance of nematodes 

 in commercial orchards in State, effective control measures of 

 nematodes in declining orchards, and how they affect replant trees 

 in established orchards, learn extent that toxic materials are 

 accumulated and translocated within mature fruit trees, and if 

 this causes off -flavor; (3) learn identity of nematodes and 

 associated diseases on productivity of forest and shade tree nurser- 

 ies; specific identity of nematodes and their role in root disease 

 complex on nursery stock; cultural and chemical control practices 

 that increase or decrease incidence and severity of nematodes and 

 nematode-disease complexes. 



PI. Path.,Bact. & Ent. 72 (NE-34) 



