DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/1962 str. 37 <-- 37 --> PDF |
4. Za tla koja nisu zaražena prevelikim brojem štetnika (nematoda) zadovoljavajuće djelovanje se postigne sa 100 ccm Vapama po 1 m° tla. 5. Do jakih zaraza unutar rasadnika dolazi uslijed gnojidbe kompostom što potvrđuje i kontrolna parcela u našem pokusu, pošto kompostom uncsimo gotovo* sve uzročnike pol´ijeganja mladih klica. Radi toga na parcelama koje bi bile gnojene stajskim gnojem i zatim tretirane Vapanom ili formalincm sigurno je da bi rezultati bili još bolji od rezultata koje smo dobili u našem pokusu. Kako će već u ovoj godini biti Vapama i na našiem tržištu vjerojatno u dovoljnoj količini, smatramo da će njegova primjena u širokoj praksi olakšati rad u proizvodnji zdravog i kvalitetnog sađnog materijala. SUMMARY RESULTS OF THE TREATMENT OF SOIL WITH VAPAM The loss from »damping-off« of coniferous seedlings is general very high in the seedbeds. Field experiments were conducted on naturally infected soil with organisms wich are known to case »damping-off«, by treating the soil with Vapam (Natrium- N-methyldithiocarbamate) and formaldehyde. Vapam is fungicide, insecticide and herbicide. A summary of the results is following: 1. The greatest percentage (90%) of Pinus silvestris seedlings emerged in the treated soil with Vapam (100 ccm in 5 1 water on 1 mä of the soil). ´In weed control Vapam gave also good results. The soil was free of weeds during two months. In our experiment, there were no noxious insects in the soil, and tor this reason it is not possible to discuss about the effect on insects. 2. There were 80% disease-free seedlings in the soil sterilized with formaldehyde. 3. All the seedlings in the treated soil grew well during all the season. 4. On control, there were very few seedlings. Many emerged seedlings died very soon from »damping-off«. Many isolations were made from bits of affected root tissue from the diseased seedlings. Fusarium spp. and Pythium spp. grew out of the isolated roots. |