Zum Geschlechtsverhältnis von Ips typographus (L.) (Coleoptera,Scolytidae) in Pheromonfallen

By means of barriere traps baited with two types ofIps typographus pheromone, Typolur and Pheroprax, nearly 240000 individuals were trapped between 1979 and 1981 in bohemian spruce stands. In the whole 64% (Typolur) resp. 61% (Pheroprax) of the beetles were females. At the beginning of the flying period the males predominated whereas some weeks later on the contrary the females were prevalent. The latter consisted of individuals founding sisterbroods. Up to 5.2% of females had lost their bristles showing that they already were through three egg laying periods.     

Flight patterns of the peach twig borer,Anarsia lineatella zell. (Lep., Gelechiidae) in central europe as observed using pheromone traps

Pheromone traps were used for monitoring phenology of the peach twig borer,Anarsia lineatella, in Central Bohemia. The pest has two generations a year, the first one (owerwintering) is usually more numerous than the second one. The peak of the flight of the first generation begins by day-degrees (DD) 400–450 °C and the peak of the flight of the second generation at DD 900–960 °C. DD data can be used for supervised control both in the case of timing the chemical treatment and for deciding on using pheromones for male confusion. The suitable term for chemical treatment in the given locality in Central Bohemia is DD 360°C (above the developmental threshold 10 °C). The injury to fruits and shoots of peach trees similar to that caused byA. lineatella does also the oriental fruit moth,Cydia molesta. According to very low catches in pheromone trapsC. molesta does not seem to be economically important in Central Bohemia at present.With 2 tables and 3 figures     

Use of land-races in Czechoslovak wheat breeding

Summary Four groups of Czechoslovak land-races (Czech alternate, Czech red, Moravian white, awnless, South Moravian and Slovak awned wheats) are characterized on the base of wheat collection studies in the Research Institute for Crop Production, Praha-Ruzyn, and their use in the breeding in SSR. A review of Czechoslovak cultivars of winter and spring wheats registered in the years 1921–1980 (table 1 and 2) and the registration period of the most important older Czechoslovak cultivars (table 3) is presented.Of the total number of 284 registered Czechoslovak cultivars in the years 1921–1980 93 cultivars were developed by selection from land-races; 70% of 87 cultivars originated from crosses had a land-race or its derivative as one of its parents. From land-races derived cultivars Chlumecká 12, eská Pesívka, Slovenská 777, Dobrovická 10 displayed the longest duration in the registration.

---

Die Verwendung von Landsorten in der tschechoslowakischen Weizenzüchtung

Zusammenfassung Vier Gruppen von tschechoslowakischen Weizenlandsorten werden auf der Grundlage von Untersuchungen an der Weizenkollektion im Institut für Pflanzenproduktion, Prag-Ruzyn, und ihrer Nutzung in der Züchtung in der SSR beschrieben. Es sind (1) tschechische Wechselweizen, (2) tschechische rote, (3) mährische weiße, grannenlose und (4) südmährische und slowakische begrannte Weizen. Ein Überblick über die in den Jahren 1921–1980 registrierten tschechoslowakischen Winter- und Sommerweizen (Tab. 1 und 2) sowie die Zeitdauer der Registrierung der bedeutendsten älteren tschechoslowakischen Sorten (Tab. 3) schließt sich an.Von insgesamt 284 in den Jahren 1921–1980 registrierten tschechoslowakischen Sorten entstanden 93 durch Auslese aus Landsorten. Bei den 87 Sorten, die aus Kreuzungen hervorgingen, hatten 70% entweder eine Landsorte oder den Abkommen einer Landsorte unter den Eltern. Die aus Landsorten hervorgegangenen Sorten Chlumecká 12, eská Pesívka, Slovenská 777 und Dobrovická 10 waren am längsten registriert.

---

- : (1) , (2) , (3) , (4) . , 1921–1980 . (. 1 2), ( ) (. 3). 284 , 1921–1980 ., 93 ë . 87- , ë , 70% . ( ) : 12, , 777 10.

---

---

Paper not delivered during the symposium     

Zur Überwachung des grünen Eichenwicklers,Tortrix viridana L. (Lep., Tortricidae) mittels synthetischen Sexualpheromons

In the period from 1986 to 1988 the synthetic sexual pheromone ofTortrix viridana L. and different types of traps were investigated in Slovakian oak forests. The dependence of male numbers per trap on the forest type groups was studied parallely as well as the attraction of pheromones for other moth species was tested, too. The pheromon TV83 (Z11-14: Ac+Z11-14: OH, 9∶1, 50 μg) and unsticky plastic trap with DDVP called “Mushroom” showed the highest effectivity. The pheromon monitoring confirmed the theory that the pest prefers the biotops with dominance ofQuercus pubescens andQ. robur. The optimum of pest was bound to forest type groups Carpineto-Quercetum und Ulmeto-Fraxinetum carpineum. The minimal number of other moth species was observed in traps with pheromons TV83 (?SFR) and Hoechst (FRG).