The possibility of controlling green oak leaf-roller moth infestations with Foray 48B (Bacillus thuringiensis Berl. subsp. kurstaki) was assessed in spring 2004 in a Sardinian pubescent oak forest. At the time of treatment, the larval density was 0.70-0.88 larvae per shoot. The insecticide was aerially sprayed at ULV in a dose of 4 l/ha (equivalent to 42.4 BIU/ha). One week later, a population reduction of 82% was observed in the treated plots. Canopy defoliation was 14% in the treated plots compared with 30% in the untreated plots. The experiment demonstrated the efficacy of Foray 48B treatment, but large-scale application requires further tests to assess the efficacy of B.t.k. in limiting oak defoliation when larval densities are high.
Efficacy of Foray 48B against Tortrix viridana L. (Lepidoptera Tortricidae) in a Sardinian pubescent oak forest
Serra G;
2005
Abstract
The possibility of controlling green oak leaf-roller moth infestations with Foray 48B (Bacillus thuringiensis Berl. subsp. kurstaki) was assessed in spring 2004 in a Sardinian pubescent oak forest. At the time of treatment, the larval density was 0.70-0.88 larvae per shoot. The insecticide was aerially sprayed at ULV in a dose of 4 l/ha (equivalent to 42.4 BIU/ha). One week later, a population reduction of 82% was observed in the treated plots. Canopy defoliation was 14% in the treated plots compared with 30% in the untreated plots. The experiment demonstrated the efficacy of Foray 48B treatment, but large-scale application requires further tests to assess the efficacy of B.t.k. in limiting oak defoliation when larval densities are high.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
