GENERAL CHARACTERISTICS OF CERTAIN INSECT PATHOGENS RELATED TO BACILLUS CEREUS

1956 ◽  
Vol 2 (2) ◽  
pp. 111-121 ◽  
Author(s):  
T. A. Angus
Keyword(s):  
Bacillus Thuringiensis ◽  
Bacillus Cereus ◽  
Bombyx Mori ◽  
North American ◽  
Quantitative Difference ◽  
Silkworm Larvae ◽  
Insect Pathogens ◽  
Bombyx Mori L ◽  
Morphological Differences ◽  
Sporulated Culture

The insect pathogens Bacillus sotto Ishiwata and Bacillus thuringiensis Berliner can be differentiated by means of certain cultural and morphological differences, and by a quantitative difference in pathogenicity for the larvae of Bombyx mori L., B. sotto being the more pathogenic. They are also pathogenic for the larvae of several North American Lepidoptera including Anisota rubicunda (F.), Anisota senatoria (A. and S.), Nymphalis antiopa (L.), Erannis tiliaria (Harr.), Datana integerrima (G. and R.), Datana ministra (Drury), Liparis dispar L., Protoparce quinquemaculata (Haw.), and Protoparce sexta (Johan.). Silkworm larvae ingesting material from a sporulated culture of B. sotto become sluggish, cease feeding, and suffer from a progressive paralysis that begins in the mid-gut area, spreads to affect the whole larva, and ends in death.

scholarly journals Effect of Antibiotics on the Haemocyte Count and Rearing Performance of Silkworm Bombyx mori L.

2020 ◽  
pp. 528-538
Author(s):  
Iqra Rafiq ◽  
Z. I. Buhroo ◽  
K. A. Sahaf ◽  
N. A. Ganie ◽  
M. F. Baqual ◽  
...  
Keyword(s):  
Bombyx Mori ◽  
Economic Traits ◽  
Silkworm Larvae ◽  
Mulberry Leaves ◽  
Survival Percentage ◽  
Bombyx Mori L ◽  
Ceftiofur Sodium ◽  
Antibiotic Agents ◽  
Silkworm Bombyx Mori ◽  
Total Haemocyte Count

Background: Antibiotic agents have been used in recent years to increase the growth of silkworm larvae and to improve production. In this context, the present investigation reported the effects of ceftiofur sodium, oxytetracycline and enroflaxcin on total haemocyte count (cells/mm3), survival percentage and economic characteristics in silkworm Bombyx mori L. at various concentration levels. The study regarding the effect of antibiotics was conducted on the silkworm breed APS-45. Three concentrations (0.05%, 0.10% and 0.15%) were prepared for each antibiotic. The worms were reared upto 3rd instar without any treatment. After third moult silkworms were supplemented with antibiotic fortified mulberry leaves. Results: The experimental results showed that the effect of different antibiotics on economic parameters like larval weight, larval duration, cocoon weight, shell ratio and raw silk percentage were significantly increased in the treated lines in comparison to the control. Antibiotics also increased survival percentage and the most effective result was obtained at 0.15% of ceftiofur sodium followed by oxytetracycline and enroflaxcin. In the present study highest THC value of 9157.33 mm/cm3 was recorded in treatment ceftiofur sodium treated batch at concentration C3 0.15%. An increment in the total haemocyte count was observed in other treatments as well and the cell count increased with an increase in concentration of antibiotic dosage and the effectiveness of the antibiotics followed the order ceftiofur sodium, oxytetracycline and enroflaxcin. Conclusion: This research outlines that there is a significant improvement in the total haemocyte count and economic traits in silkworm with the supplementation of antibiotic fortified mulberry leaves. The antibiotic treatment has significantly improved the raw silk percentage and has been found to be effective in reducing the mortality of silkworms. So, this antibiotic fortification can be further exploited for higher raw silk production.

ENTOMOPATÓGENOS ASSOCIADOS A LAGARTAS DE BOMBYX MORI L. (LEPIDOPTERA: BOMBYCIDAE) NO ESTADO DO PARANÁ

2007 ◽  
Vol 74 (4) ◽  
pp. 363-367
Author(s):  
M. Potrich ◽  
L.F.A. Alves ◽  
R.C. Brancalhão ◽  
G. Dalcin
Keyword(s):  
Bacillus Thuringiensis ◽  
Bombyx Mori ◽  
De Se ◽  
Bombyx Mori L

RESUMO O Estado do Paraná é o maior produtor sericícola brasileiro. A atividade é explorada em aproximadamente 200 municípios, envolvendo cerca de 7.000 produtores rurais. Durante o estágio de lagarta, o bicho-da-seda (Bombyx mori L.) é susceptível a doenças causadas por vírus, fungos e bactérias. Estas doenças podem gerar sérios danos na produção de casulos e, conseqüentemente, prejuízos para o produtor. Com o objetivo de se verificar os entomopatógenos associados a lagartas de B. mori no Estado do Paraná, foi desenvolvido o presente trabalho nas principais regiões produtoras, no período de novembro de 2002 a abril de 2003. Para tanto, lagartas suspeitas de infecção, vivas e/ou mortas foram coletadas diretamente dos barracões de criação das empresas sericícolas. O material coletado foi armazenado em frascos plásticos identificados e colocado em caixas térmico. No laboratório, as lagartas foram processadas utilizando-se metodologias específicas de acordo com o patógeno suspeito. Após o isolamento foram identificados os entomopatógenos Baculovírus (31,4%), Beauveriabassiana (Bals.) Vuill. (5,3%) e Bacillus thuringiensis Berliner (2,2%).

THE TAXONOMY OF INSECT PATHOGENS RELATED TO BACILLUS CEREUS FRANKLAND AND FRANKLAND

1958 ◽  
Vol 4 (5) ◽  
pp. 531-541 ◽  
Author(s):  
A. M. Heimpel ◽  
T. A. Angus
Keyword(s):  
New Species ◽  
Bacillus Thuringiensis ◽  
Bacillus Cereus ◽  
Type Species ◽  
Identification Key ◽  
New Variety ◽  
Bacillus Spp ◽  
Insect Pathogens

The characteristics of seven crystal-forming Bacillus spp. are compared and an identification key is presented. It is concluded that the following changes in nomenclature are desirable: Bacillus thuringiensis Berliner becomes the type species Bacillus thuringiensis var. thuringiensis n. comb.; Bacillus sotto Ishiwata becomes Bacillus thuringiensis var. sotto n. comb.; and Bacillus cereus var. alesti Toumanoff and Vago becomes Bacillus thuringiensis var. alesti.Two new species, Bacillus entomocidus n. sp. and Bacillus finitimus n. sp., and a new variety, Bacillus entomocidus var. subtoxicus n. sp., are described.

scholarly journals Studies on Mycoplasma Isolated from Silkworm Larvae (Bombyx mori L.) Infected with So-Called Infectious Flacherie

1969 ◽  
Vol 24 (1) ◽  
pp. 22-27
Author(s):  
Toshihiko KAWAKITA ◽  
Kaneo HAYASHI ◽  
Takuya WATANABE ◽  
Seiichi MURAKAMI
Keyword(s):  
Bombyx Mori ◽  
Silkworm Larvae ◽  
Bombyx Mori L

Effect of Gallic Acid on the Growth of the Silkworm Larvae Bombyx mori L.

Nature ◽  
1966 ◽  
Vol 212 (5068) ◽  
pp. 1386-1387 ◽  
Author(s):  
YASUJI HAMAMURA ◽  
KAZUKO KUWATA ◽  
HIROSHI MASUDA
Keyword(s):  
Gallic Acid ◽  
Bombyx Mori ◽  
Silkworm Larvae ◽  
Bombyx Mori L

scholarly journals Effects of Several Components from the Leaves of Four Species of Plants on the Growth of Silkworm Larvae, Bombyx mori L.

1976 ◽  
Vol 20 (1) ◽  
pp. 26-30 ◽  
Author(s):  
Shigeo MURAKOSHI ◽  
Toshiya KAMIKADO ◽  
Ching-Fun CHANG ◽  
Akira SAKURAI ◽  
Saburo TAMURA
Keyword(s):  
Bombyx Mori ◽  
Silkworm Larvae ◽  
Bombyx Mori L
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