Bio-efficacy of bacterial insecticide,Bacillus thuringiensis Berl. as biological control agent against snails vectors of Schistosomiasis in Egypt

1991 ◽  
Vol 64 (7) ◽  
pp. 136-139 ◽  
Author(s):  
G. Y. Osman ◽  
A. M. Mohamed
Keyword(s):  
Biological Control ◽  
Bacillus Thuringiensis ◽  
Biological Control Agent ◽  
Control Agent

Evaluation of a formulation of Bacillus thuringiensis against waxmoths in stored honeycombs

1991 ◽  
Vol 31 (5) ◽  
pp. 709 ◽  
Author(s):  
SC McKillup ◽  
DG Brown
Keyword(s):  
Biological Control ◽  
Apis Mellifera ◽  
Bacillus Thuringiensis ◽  
Field Experiment ◽  
Biological Control Agent ◽  
Control Agent ◽  
Control Methods ◽  
Commercial Formulation ◽  
Significant Damage ◽  
The Cost

Waxmoths cause significant damage to stored honeycombs of the Western honeybee Apis mellifera in Australia. A field experiment was designed to evaluate the effectiveness of a commercial formulation (Certan) of the biological control agent Bacillus thuringiensis in preventing this damage.Treatment applied at the manufacturer's recommended rate of 855 units per cm2 of honeycomb almost completely prevented damage, while untreated combs showed an average of 76% damage. The cost and practicality of applying the formulation of B. thuringiensis are discussed, together with the recommendation that new control methods for waxmoths should be researched.

scholarly journals Evaluating the efficacy of Trichoderma harzianum and Bacillus thuringiensis on induce the plant growth and resistance of local variety patchouli under covered and uncovered seedlings methods

2022 ◽  
Vol 951 (1) ◽  
pp. 012106
Author(s):  
R Sriwati ◽  
T Chamzurni ◽  
F Razi ◽  
Syaifullah ◽  
Yunita ◽  
...  
Keyword(s):  
Biological Control ◽  
Bacillus Thuringiensis ◽  
Plant Growth ◽  
Biological Control Agent ◽  
Dose Range ◽  
Morphological Characters ◽  
Control Agent ◽  
Plant Diseases ◽  
Biological Control Agents ◽  
Pests And Diseases

Abstract To increase plant resistance from an early age, it is necessary to introduce biological control agents from groups of fungi and bacteria. This study aims to determine the effect of Trichoderma harziaunum and Bacillus thuringiensis Aceh isolates in increasing the superiority of Aceh patchouli plants that are resistant to pests and plant diseases. The study used non-factorial RAL method with cover and uncovered seedling methods. Both series were treated with the same biological control agent, the control without any treatment, the treatment of T. harzianum and B. thuringiensis while the observations were made when the seedling covered was opened. Observations included plant morphological characters, plant growth development and peroxidase enzymes. The results showed that morphologically the original patchouli growing in Lhoong district had similar morphological characters to the Lhokseumawe variety. The application of biological control agents of the T. harzianum and B. thuringiensis groups was more effective in increasing plant growth in the closed seedling treatment compared to the uncovered seedling. T. harzianum gave the best effect at a dose range of 1-1.5 while B. thuringensis showed a better effect at a concentration of 10-15 ml. Both treatments increased the growth of patchouli seedlings as indicated by the better plant height and number of shoots. Furthermore, higher peroxidation enzymes were found in the closed seedling treatment with 1.5 g T harzianum and 15 ml B. thuringiensis. The high peroxidase enzyme as an indicator of the more resistant plants have been induced to pests and diseases. From the screen house experiment, T. harzianum and B. thuringiensis were more efficient in inducing plant growth and disease resistance of local varieties of patchouli using the closed seedling method.

Insecticidal effects of some biological agents on Agelastica alni (Coleoptera: Chrysomelidae)

Biologia ◽  
2006 ◽  
Vol 61 (6) ◽  
Author(s):  
Kazım Sezen ◽  
Zihni Demirbağ
Keyword(s):  
Biological Control ◽  
Bacillus Thuringiensis ◽  
Insecticidal Activity ◽  
Biological Control Agent ◽  
Bacillus Sphaericus ◽  
Leaf Beetle ◽  
Control Agent ◽  
Biological Agents ◽  
Economic Damage ◽  
Melolontha Melolontha

AbstractThe alder leaf beetle (Agelastica alni L., Coleoptera: Chrysomelidae) causes approximately 10% of total economic damage to hazelnut product per year in Turkey. A. alni larvae are susceptible to several pathogens indigenous to the area in which these insects occur in Turkey. In the present study, in order to find a more effective and safer biological control agent against this common pest, we evaluated the various biological agents’ insecticidal activity during the four hazelnut seasons from 2002 to 2005 on the larvae of the alder leaf beetle collected from the vicinity of Trabzon, Turkey. The tested agents are 25 insect-originating bacteria, 2 bacterial toxins and 1 viral preparation. The results showed that the highest insecticidal activity was obtained by bacterial isolates at 1.8 × 109 bacteria/mL dose, within ten days on the larvae of A. alni. These are 90% for Bacillus thuringiensis biovar tenebrionis (4AA1), Bacillus sphaericus (Ar4, isolated from Anoplus roboris L., Col.: Curculionidae), and Bacillus thuringiensis (Mm2, isolated from Melolontha melolontha L., Col.: Scarabaeidae). Our results indicate that these isolates may be valuable as biological control agent.

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