Über die Verbreitung von Bacillus thuringiensis Berl. und einiger Sporozoen-Krankheiten bei vorratsschä dlichen Lepidopteren im Gebiet von Kosova, Jugoslawien

Abstract

On the distribution of Bacillus thuringiensis Berl. and some Sporozoon diseases of store damaging Lepidoptera in the Kosova region, Yugoslavia

The studies concerning the incidence and distribution ofBacillus thuringiensis Berl. and various Sporozoa, such asMattesia dispora Naville (Weiser, 1954),Nosema heterosporum Kellen & Lindengren,Telochania ephestiae Mattes andAdelina mesnili Perez, as well as the quantitative and qualitative relationships of both groups of pathogens to various store product destroying Lepidoptera, were carried out with specimens found in 57 watermills at 22 localities in the are of Kosova, Yugoslavia.

A total of 3065 dead and living larvae ofEphestia kühniella infected withBacillus thuringiensis and Sporozoa were examined. Other larvae also examined after infection withB. thuringiensis included specimens ofE. elutella, Plodia interpunctella, Plutella maculipennis andPyralis farinalis.

Regarding the relationships of the overall intensity of infection of theE. kühniella larvae to the portion of the insects examined (table 2), the following habitats displayed the highest percentage: Hulaj and Tekuli 100%, Prizreni 86% and Isniqi 80%. The intensity of the larvae infected withB. thuringiensis was highest at Istogu 35%, Radavci 33% and Isniqi 32%. The greatest incidence of Sporozoan infections was in the following habitats: WithMattesia dispora: Kabashi 80% and Strellci 74%; withNosema heterosporum: Peja (Peć) 39% and Rugova 35 %; withAdelina mesnili: Kashica 28%, Strellci and Gjakova 21%.

Further data from table 3 indicate that theE. kühniella larvae infected withBacillus thuringiensis were spread relatively widely and evenly throughout all the examined habitats in the area of Kosova. But onlyEphestia kühniella was infected at all of 22 localities.