scholarly journals Effect of Methoprene on larval and cocoon weight, ovariole length, egg number and fecundity of Bombyx mori L

2017 ◽  
Vol 8 ◽  
pp. 37
Author(s):  
S.B. Magadum ◽  
Μ.Α. Hooli ◽  
V.B. Magdum
Keyword(s):  
Bombyx Mori ◽  
Larval Weight ◽  
Silkworm Larvae ◽  
Egg Number ◽  
Repeated Applications ◽  
Bombyx Mori L

The effect of Methoprene on larval and cocoon weight, ovariole length, egg number and fecundity of BombYx mori (Polyvoltine Pure Mysore breed) was stu­died. Methoprene at 2.75,4.0 and 8.0 pg!ml dilutions was topically applied/sprayed on silkworm larvae repeatedly at 36h in 3rd, 4th and 5th stadium, at 48h in 4th and 5th stadium and singly at 72h in 5th stadium. Of the various dosages used, the repeated applications of 2.75 pg/ml at 36h in 3rd, 4th and 5th stadium of silkworm larvae resulted in significant increase in larval weight, cocoon weight, ovariole length, ovariole egg number and fecundity when compared to untreated controls.

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.

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 Supplementation of Lactobacillus casei reduces the mortality of Bombyx mori larvae challenged by Nosema bombycis

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Siripuk Suraporn ◽  
Olle Terenius
Keyword(s):  
Bombyx Mori ◽  
Lactobacillus Casei ◽  
Control Group ◽  
Survival Ratio ◽  
Larval Weight ◽  
Silkworm Larvae ◽  
Hybrid Strain ◽  
Shell Weight ◽  
Nosema Bombycis ◽  
Growth Characters

Abstract Objective Pebrine, caused by the microsporidium Nosema bombycis, is one of the severe diseases in Thai polyvoltine strains of the silkworm Bombyx mori. Studies showing the presence of Lactobacillus species in the silkworm gut, where the Nosema parasites enter, suggests that these bacteria may have a protective effect. The aim of this study was to investigate the effect of supplementation of Lactobacillus casei on the survival ratio of silkworm larvae challenged with N. bombycis. Results A group of silkworm larvae of the commercial Thai polyvoltine hybrid strain DokBua was supplemented with L. casei on the second day of the 2nd, 3rd, 4th, and 5th instar. When a control group of silkworm larvae were challenged with N. bombycis on the second day of the 4th instar, the survival rate was 68%, but it was 91% for larvae supplemented with L. casei. For those larvae that survived the treatments until pupation, we determined the growth characters larval weight, cocooning ratio, and pupation ratio, and the economic characters cocoon weight and cocoon shell weight. When infected with N. Bombycis, growth characters were significantly higher in larvae also receiving L. casei.

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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