Trials on the use of Bacillus thuringiensis preparations (Bt) to control infestations of important pests of forest (pine and oak) and crop plants (olive and grapevine) were carried out in Tuscany (Italy). Preparations of Bt (Dipel, Thuricide HP, Bactospein, Bactucide P and Biobit) were used in pine forests against I and II, and also IV and V, instar larvae of Thaumetopoea pityocampa. The highest mortality rates of the young larvae were caused by Dipel (from 80.4% to 81.8%) and by Bactospein (from 74.7% to 75.7%). When these products were employed against the IV and V instar larvae the mortality values were strongly reduced (from 7.18% to 29.6%). Tests, again against young PPC larvae, were carried out in the laboratory to verify the length of effectiveness of the preparations; the first dead larvae were noted 4 days after the treatment and the insecticide action was monitored until the 16th day after the application. Dipel, Bactospein and Bacture were used against I and II instar larvae of Lymantria dispar, both in field and in laboratory tests, and against III and IV instar larvae of Euproctis chrysorrhoea, only in the laboratory. Again Dipel was the most effective (larval mortality of L. dispar was 85.8% in the field tests and 85% in the laboratory tests; the mortality rate of E. chrysorrhoea larvae was 75.5%). Dipel, Thuricide HP and Bactucide P were used in vineyard against Lobesia botrana I and II instar larvae of the second generation. Infestation in the portions of rows which had been treated with the three products was reduced significantly; Thuricide HP was the most effective in reducing bunch infestations and, together with Dipel, it also reduced grape infestations. A treatment with Thuricide HP was made in field against the II and IV instar Prays oleae larvae of the first generation. Even if the percentage mortality was rather high (74.71% in comparison with 16.98% of the control) there was no difference in the olive infestation caused by the subsequent generation of olive moth in comparison with the control.
Control test against agricultural and forest pests using Bacillus thuringiensis Berliner / T. PANZAVOLTA;A. NICCOLI; G.SURICO ; R.TIBERI. - STAMPA. - (2005), pp. 113-113. (Intervento presentato al convegno 10th European Meeting "Invertebrate pathogens in biological control: Present and Future" tenutosi a LOCOROTONDO (BARI) nel June 10-15, 2005).
Control test against agricultural and forest pests using Bacillus thuringiensis Berliner.
PANZAVOLTA, TIZIANA;SURICO, GIUSEPPE;TIBERI, RIZIERO
2005
Abstract
Trials on the use of Bacillus thuringiensis preparations (Bt) to control infestations of important pests of forest (pine and oak) and crop plants (olive and grapevine) were carried out in Tuscany (Italy). Preparations of Bt (Dipel, Thuricide HP, Bactospein, Bactucide P and Biobit) were used in pine forests against I and II, and also IV and V, instar larvae of Thaumetopoea pityocampa. The highest mortality rates of the young larvae were caused by Dipel (from 80.4% to 81.8%) and by Bactospein (from 74.7% to 75.7%). When these products were employed against the IV and V instar larvae the mortality values were strongly reduced (from 7.18% to 29.6%). Tests, again against young PPC larvae, were carried out in the laboratory to verify the length of effectiveness of the preparations; the first dead larvae were noted 4 days after the treatment and the insecticide action was monitored until the 16th day after the application. Dipel, Bactospein and Bacture were used against I and II instar larvae of Lymantria dispar, both in field and in laboratory tests, and against III and IV instar larvae of Euproctis chrysorrhoea, only in the laboratory. Again Dipel was the most effective (larval mortality of L. dispar was 85.8% in the field tests and 85% in the laboratory tests; the mortality rate of E. chrysorrhoea larvae was 75.5%). Dipel, Thuricide HP and Bactucide P were used in vineyard against Lobesia botrana I and II instar larvae of the second generation. Infestation in the portions of rows which had been treated with the three products was reduced significantly; Thuricide HP was the most effective in reducing bunch infestations and, together with Dipel, it also reduced grape infestations. A treatment with Thuricide HP was made in field against the II and IV instar Prays oleae larvae of the first generation. Even if the percentage mortality was rather high (74.71% in comparison with 16.98% of the control) there was no difference in the olive infestation caused by the subsequent generation of olive moth in comparison with the control.
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