Obstbaume , 



vom Fachmann 



Fur die Pflanzsaison 1993/94 smd noch 

 folgende Obslsonen erhalilich: 



M26 IVI27' 

 M27 • 



M25 



M26 

 M25 

 K/127- 



M27 ■ 



M26 



M26 



M26 

 M26 



M26 

 M26 

 ti(l26 

 M27 

 M27 

 M27 

 M26 



M26 



M26 

 M26 

 M26 

 M26 

 M26 

 M27 



M27 



M27 



M27 •, 



M27 



Sortenschut2 



Zudem fuhren wir noch 

 mehrere Aplelsorten sowie 

 ein grosses Angebot an 

 Tafelbirnen-, Zwetschgen- 

 und KIrschbaumen sowie ein 

 grosses Sortlment an Apfel-, 

 Moslbirnen-. Zwetschgen- 

 und Kirschhochstammen. 



Erich Dickenmann AG 

 Dipl. Obstbautechnlker HTL 

 8566 Ellighausen TG 

 TbI.072 68 16 29 

 Fax 072 6810 29 



Typical offerings from a Swiss nursery. 

 Note abundance of cultivars on M.9 and 

 M.27. 



pests, particularly codling moths, and diseases. 

 Not only is one not allowed to just cut them 

 down, but the federal government rewards 

 farmers for planting more! So the proposal of 

 Ron Prokopy to eliminate untreated apples 

 within 100 yards of commercial orchards, to 

 reduce greatly codling moth colonization, would 

 be viewed as heresy in Switzerland. 



Pest and Pesticide Differences 



The pest complex of European apple or- 

 chards varies from country to coLintry, but in 

 general the major insect pests are tortricids 

 (codling moth and others), and aphids, particu- 

 larly Dysaphis species, relatives of the rosy 

 apple aphid. Relatively selective treatments are 

 available to suppress these key pests, resulting 

 in an enormous decrease in mite problems. 

 These selective treatments include IGRs (insect 

 growth regulators), primarily diflubenzuron 

 (Dimilin''"'*), fenoxycarb (Insegar''""), and 

 teflubenzuron (Nomolt'"'") for tortricids. All tor- 

 tricid species are not equally susceptible. Spe- 

 cies-specific viral preparations are available for 

 codling moth and summer fruit tortrix 

 (Adoxyphes orana). These require three to four 

 applications against each generation of codhng 

 moth, and superficial injury may occur never- 

 theless because of delayed mortality of the 

 young larvae. 



Pirimicarb (Pirimor"^") is a selective 

 aphidicide (with some action against other 

 piercing-sucking insects) registered worldwide 

 for about 20 years, except in the U.S.A. It is 

 extremely valuable not only in apples but in 

 crops such as cole crops where aphids can be 

 controlled without upsetting biological control 

 of other pests. The availabihty of selective 

 insecticides has reduced some pest problems, 

 but it has increased others. Broad-spectrum 

 insecticides against codhng moths previously 

 also suppressed other tortricids. Non-selective 

 treatments directed against aphids oflen re- 

 duced populations of apple sawfly (the satoe one 

 found in North America) and other early-s-eason 

 pests to below economically-damaging levels. 

 Now, more research is necessary to address 

 these previously unimportant pest problems. 



FruH Notes, Summer, 1994 



23 



