| Titles |
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English :
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Biological control of the wax moth
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Arabic :
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المكافحه الحيويه لدودة الشمع
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| Abstract |
Effect of Bacillus thurinqiensis Berliner on the bioactivity and longevity of honeybee, Apis mellifera L. had been studied . Larval mortality, pupal formation and moth emergence of Galleria. mellonella L.. and Achroia grisella(F.), as affected by feeding on different foods treated with the bacterium, were also recorded.
Host preference by Bracon hebetor Say and number of developed parasites on a single host larva of the wax moths were determined. The biological aspects of the parasite, deprived of its host species, were also investigated. The obtained results are summarized as follows:
A. Bacillus thuringiensis:
l. B. thurinqiensis, at 0.2% (5 x 10 7 viable
spores/ml.), did not affect the normal activity of the
honeybees.
2. The bacterium proved to be harmless to the honeybee
workers; even at 0.6% (15 x 107 viable spores/ml.).
3. When the first instar larvae of both wax moths were
fed on wax combs treated as wax foundations with 0.2% Bactospeine, their mortality rates significantly
increasecz as the,period of. inspection prolonged. LT50 values were 7.1 and 10.9 days for G . mellanella and A . grisella, respectively.
4. By feeding the first instat larvae of both wax moths on wax combs treated with different concentrations of the bacterium, their corrected mortalities were increased as the tested concentration was increased. Meanwhile, LC50 values inversely correlated with the period of inspection. They reached 0.36 , 0.12 and 0.04% for G. mel1onella after 3,5 and 7 days of feeding, respectively. The corresponding figures for A. qrise11a were 1.03, 0.87 and 0.83%. Moreover, the mortality percentage was increased as the period of inspection elongated. Furthermore, the higher the concentration, the lower was the LT50 and vice versa. LT50s were 4.20 3,16, 1.1.9 and 1.85 days for G.. mellonella at, 0.2, 0.4, 0.6 and 0.8%, respectively. The opposed values for A. grisella reached 10.96, 10.72, 10.52 and 8.13 days.
5-Spraying of the wax combs with 0.2% Bactospeine was more effective against G. mellonella than that of the wax foundations. However, the two treatments had the same influence on A. grisella.
6- When the first and second instar larvae of`the wax moths were fed on the artificial diet treated with 0.2% Bactospeine, their mortal ity percentages were progressively increased as the time of inspection prolonged. LT50 values reached 3.1 and 3.2 days for the lst and 2nd. inatars of G. mellonella, respectively. The respective figures for those of A. grisella were 6.3 and 6.9 days. Therefore, the younger -the age of larvae, the higher was the effectiveness of B. thuring.iensis and vice versa.
7- Rates of pupation and moth emergence of both insect species were greatly reduced in the treated food compared with the untreated one. They were also decreased with the increase in the The concentration used.
8- Larvae of G. mollonella were more susceptible -to the pathogen than those of A. grisella.
B-- Bracon hebetor :
1-When the larvae of both wax moths were exPosed simultaneously to the female of B. hebetor, the number of paralyzed larvae greatly exceeded that of parasitized ones. Moreover, the numbers of paralyzed and parasitized larvae of G. mellonella were significantly higher than those of A. grisella. Furthermore, the parasitic female preferred for oviposition -the larvae of the former than those of the latter.
2- B. hebetor paralyzed and parasitized greater numbers of A. grisella than G. mellonella when they were exposed separately. The former, pest may be more sensitive to the parasite venom than the latter one.
3- G.. mellonella seemed to be more suitable for rearing the parasite than A. qrisella, as the former host produced a relatively greater number of adult parasites.
4- Absence of the host larvae significantly shortened the oviposition period and longevity of the parasite. Moreover, it greatly reduced the fecundity, Progeny production and sex ratio. Furthermore, these undesirable effects were more pronounced with A. grisella than G rnellonella.
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| Publication year |
1991
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| Availability location |
معهد بحوث وقاية النباتات
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| Availability number |
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| Country |
Egypt
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| Publisher |
Name:
كليه الزراعه-جامعه عين شمس
Place:
القاهرة-مصر
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| Author(s) from ARC |
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| Agris Categories |
Protection of plants - General aspects
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AGROVOC
TERMS |
Apis mellifera.
Bacillus thuringiensis.
Beeswax.
Biological control.
Bracon hebetor.
Galleria mellonella.
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| Proposed Agrovoc |
Achroia grisella;
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| Publication Type |
Master Thesis
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