- 22 - • 



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

 and Forest Tree Seedlings , To learn (1) effect of nematodes 

 on growth and productivity of young fruit trees, nature of 

 parasitism of ecto -parasitic nematodes on roots, deciduous 

 fruit tree host range of parasitic nematodes found In state, 

 and suitable nurse crop for rearing cultures of nematodes, 

 meas\ares suitable for commercial control of nematodes on 

 young trees, extent that toxic materials are absorbed and 

 translocated, and if this causes off -flavor; (2) role of 

 nematodes in lack of productivity and early decline of estab- 

 lished plantings of fruit trees, and failure of replant trees 

 to thrive, occurrence and relative importance of nematodes in 

 commercial orcheirds in state, effective control meeusures of 

 nematodes in declining orchards, and how they affect replant 

 trees in established orchards, learn extent that toxic mater- 

 ials 6tre accumulated and translocated within mature fruit 

 trees, and if this causes off -flavor; and, (3) identity of 

 nematodes and associated diseases on productivity of forest 

 and shade tree nurseries, specific identity of nematodes and 

 their role in root disease complex on nursery stock, cultxoral 

 and chemical control practices that increase or decrease in- 

 cidence and severity of nematodes and nematode -disease complexes. 

 Plant Path,, Bact,, Ent. 72 (NE-3i»-. See Part 17, Section a) 



Wis , Orchard Fruit Diseases and Their Control, Especially 



Apple Scab, Fire Blight and Rust and Cherry Leaf Spot and Brown 

 Rot , To develop a basis and more effective method for control 

 of the chief destructive diseases of fruits in Wisconsin. 

 Plant Path, 301 -a 



Insect Control 



La, Biology and Control of Insects Affecting Vegetable and 



Fruit Crops , To (1) obtain more complete information on biology 

 of Insects suffecting vegetable and fimit crops; (2) evaluate 

 damage caused by various species; (3) develop control measures 

 allowing for production of vegetable and fruit crops free from 

 insect damage and excessive insecticide residues; and, (U) in- 

 vestigate possibilities of using cultural practices, time of 

 planting methods and virus diseases of insects as further meeuas 

 of control, 



Ent, k06 



Maine The Influence of Modified Spray Programs on PcLrasites and 

 Predators of Orchard Insect Pests in Maine . Learn (1) extent, 

 occiirrence, and Importance of peiras it ic -predatory fauna; (2) 

 si)ecies which might effect orcheurd Insect pest control under 

 state conditions, and degree of control expected; (3) length of 

 time that must pass before these biological agents effect control 

 of pests in an orchsLrd removed from a standard control practice 

 and placed on a modified program, and extent of damage by pests 

 until they eire brought binder control; auid, (k) factors promoting 

 an increase and maintaining a balance between agents and hosts. 

 Ent, 108 



