scholarly journals Effects of two formulations based on Bacillus thuringiensis subsp. israelensis on Aedes aegypti mosquito larvae under laboratory conditions

2008 ◽  
Vol 23 (4) ◽  
pp. 251-258
Author(s):  
Milenka Peric ◽  
Mirjana Prijovic ◽  
Goran Andric
Keyword(s):  
Bacillus Thuringiensis ◽  
Aedes Aegypti ◽  
Aqueous Suspension ◽  
Pure Water ◽  
Clay Content ◽  
Experimental Period ◽  
Mosquito Larvae ◽  
Water Dispersible ◽  
Bacillus Thuringiensis Subsp ◽  
Zero Time

Toxicity and persistence of two formulations based on Bacillus thuringiensis subsp. israelensis applied to Aedes aegypti mosquito larvae were tested under laborabory conditions. The formulations were: a) water dispersible granules (product VectoBac WDG), and b) aqueous suspension (product VectoBac 12AS). The effects of both products on mosquito larvae were tested immediately after their dilution in pure water (zero time) and in 1-, 2-, 8- and 13-day old solutions. The two products were also tested in mixtures of water and clay at a rate of 0.5 g clay/150 ml water immediately after product dilution, and in one-day old solutions containing 0.1 and 0.05 g of clay in the same amount of water. The product VectoBac WDG was persistent and highly effective against Ae. aegypti larvae in pure water after the longest experimental period of 13 days, and significantly more effective than VectoBac 12AS at equal rates of application. The effectiveness of VectoBac 12AS weakened significantly after 8 and 13 days of treatment, compared to the effects at zero time and in 1- and 2-day old solutions. High clay content in water significantly reduced the larvicidal effectiveness of both products, indicating its possible compromising role during product application in practice.

scholarly journals Toxicity of Cry2 proteins from Bacillus thuringiensis subsp. thuringiensis strain T01-328 against Aedes aegypti (Diptera: Culicidae)

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Marina Cabral Ricoldi ◽  
Camila Soares Figueiredo ◽  
Janete Apparecida Desidério
Keyword(s):  
Bacillus Thuringiensis ◽  
Aedes Aegypti ◽  
Public Health Problem ◽  
Mosquito Larvae ◽  
Major Public Health Problem ◽  
Virus Diseases ◽  
Expression In Escherichia Coli ◽  
Bacillus Thuringiensis Subsp ◽  
Zika Fever ◽  
Thuringiensis Strain

ABSTRACT: Bacillus thuringiensis subsp. israelensis has been used to control the Aedes aegypti (Diptera: Culicidae) mosquito larvae, the vector of virus diseases such as dengue, Chikungunya and Zika fever, which have become a major public health problem in Brazil and other tropical countries since the climate favors the proliferation and development of the transmitting vector. Because B. thuringiensis has shown potential for controlling insects of the Diptera order, this work aimed at testing the Bacillus thuringiensis subsp. thuringiensis strain T01-328 and its proteins Cry2Aa and Cry2Ab for control A. aegypti and at comparing the results to the B. thuringiensis subsp. israelensis specific dipteran strain. To this end, bioassays using spore-crystal of both strains, and Cry2Aa and Cry2Ab proteins from the heterologous expression in Escherichia coli, were performed against A. aegypti larvae. The results showed that the B. thuringiensis thuringiensis T01-328 has insecticidal activity against the larvae, but it is less toxic than B. thuringiensis subsp. israelensis. Cry2Aa and Cry2Ab proteins expressed heterologously were effective for controlling A. aegypti larvae. Therefore, the results indicate that the Cry2Aa and Cry2Ab proteins of the B. thuringiensis thuringiensis T01-328 can be used as an alternative to assist in the control of A. aegypti.

scholarly journals Cloning and Expression of Two Crystal Protein Genes, cry30Ba1 and cry44Aa1, Obtained from a Highly Mosquitocidal Strain, Bacillus thuringiensis subsp. entomocidus INA288

2006 ◽  
Vol 72 (8) ◽  
pp. 5673-5676 ◽  
Author(s):  
Takeshi Ito ◽  
Tomonori Ikeya ◽  
Ken Sahara ◽  
Hisanori Bando ◽  
Shin-ichiro Asano
Keyword(s):  
Bacillus Thuringiensis ◽  
Aedes Aegypti ◽  
Culex Pipiens ◽  
Crystal Protein ◽  
Cloning And Expression ◽  
Culex Pipiens Pallens ◽  
Bacillus Thuringiensis Subsp ◽  
Pipiens Pallens ◽  
Crystal Protein Genes

ABSTRACT Two novel crystal protein genes, cry30Ba and cry44Aa, were cloned from Bacillus thuringiensis subsp. entomocidus INA288 and expressed in an acrystalliferous strain. Cry44Aa crystals were highly toxic to second-instar Culex pipiens pallens (50% mortality concentration [LC50] = 6 ng/ml) and Aedes aegypti (LC50 = 12 ng/ml); however, Cry30Ba crystals were not toxic.

scholarly journals PERBANDINGAN EFEKTIVITAS TEMEPHOS DENGAN Bacillus thuringiensis var. israelensis TERHADAP MORTALITAS NYAMUK Aedes aegypti DARI TIGA KELURAHAN DI KOTA SAMARINDA

2019 ◽  
Vol 12 (1) ◽  
pp. 46-53
Author(s):  
Sri Nadyar Ekawati ◽  
Nova Hariani ◽  
Sudiastuti Sudiastuti
Keyword(s):  
Bacillus Thuringiensis ◽  
Aedes Aegypti ◽  
Dengue Hemorrhagic Fever ◽  
Hemorrhagic Fever ◽  
Mosquito Larvae ◽  
Recommended Dosage ◽  
New Type ◽  
The Government

AbstrakPengendalian vektor penyakit demam berdarah (DBD) di Indonesia menggunakan larvasida temephos telah berlangsung lebih dari 30 tahun, oleh karena itu, perlu dilakukan penelitian untuk mengetahui efektivitas temephos dan Bacillus thuringiensis var. israelensis yang merupakan larvasida jenis baru dari agen biologi terhadap larva nyamuk Aedes aegypti. Penelitian ini bertujuan untuk mengetahui perbandingan efektivitas temephos dengan B. thuringiensis var. israelensis terhadap mortalitas larva nyamuk Ae. aegypti dari tiga Kecamatan di Samarinda, yaitu Kecamatan Samarinda Utara Kelurahan Gunung Lingai, Samarinda Ulu Kelurahan Air Putih dan Sungai Kunjang Kelurahan Loa Bakung. Metode yang digunakan adalah metode bioassay. Hasil penelitian menunjukan bahwa temephos tidak efektif untuk membunuh larva nyamuk Ae. aegypti dari tiga kelurahan yang diamati, dengan LC50,24jam sebesar 1,88–2,24 ppm dan LC90,24jam sebesar 2,07–3,59 ppm. Sementara itu, B. thuringiensis var. israelensis masih efektif untuk membunuh larva nyamuk Ae. aegypti dari ketiga kelurahan yang diamati, dengan LC50,24jam sebesar 0,93–1,00 mL/50 L air dan LC90,24jam sebesar 1,05–1,11 mL/50 L air. Hal ini berarti penggunaan B. thuringiensis var. israelensis dengan dosis yang dianjurkan pemerintah masih efektif untuk mengendalikan populasi nyamuk Ae. aegypti.AbstractThe control of dengue hemorrhagic fever (DHF) vector in Indonesia using larvicide temephos has been ongoing for more than 30 years. Hence, it is necessary to assess the effectiveness of temephos compared to Bacillus thuringiensis var. israelensis which is a new type of biological larvacide agent against Aedes aegypti mosquito larvae. This study aimed to determine the effectiveness of temephos compared to B. thuringiensis var. israelensis against mortality of Ae. aegypti mosquito larvae sampled from three subdistricts in Samarinda namely Samarinda Utara Subdistrict Gunung Lingai, Samarinda Ulu Subdistrict Air Putih, and Sungai Kunjang Subdistrict Loa Bakung. The method used was bioassay. The results showed that temephos was not effective in killing Ae. aegypti mosquito larvae from the three subdistricts observed, with LC50.24 hours by 1.88–2.24 ppm, and LC90,24 hours by 2.07–3.59 ppm. Meanwhile, B. thuringiensis var. israelensis is still effective in killing Ae. aegypti mosquito larvae from the three subdistricts observed, with LC50.24 hours by 0.93–1.00 mL/50 L of water and LC90,24 hours by 1.05–1.11 mL/50 L of water. Those results mean that the application of B. thuringiensis var. israelensis with the recommended dosage of the government is still effective in controlling the population of Ae. aegypti.

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