A kind of prevention and controls for silkworm double cross original seed granulosis semina vertical transmission
Technical field
The invention belongs to sericultural production field, and in particular to one kind is vertically passed for silkworm double cross original seed granulosis semina
The prevention and controls broadcast.
Background technology
Pebrine disease be the pathogenicity microsporidian infected silkworms such as nosema bombycis (Nosema bombycis) and
A kind of infectiousness silkworm epidemic disease occurred.The disease both can also make silkworm egg band poison through being infected under mulberry leaves food through germinal infection, because
This disease always extremely pay attention to by industry, is the unique object of silkworm egg quarantine.
China's silkworm and mulberry development of the 80s and 90s in last century is swift and violent, and silkworm egg production facility falls behind and technical management is extensive causes
Pebrine disease is very popular in China.In recent years, changing with sericulture region, production of hybrid seeds environment and management mode
Become, pebrine disease has revivable sign, heavy economic losses is brought to sericulture industry again.
Currently, the cultivated silkworm breed variety of popularization and application is all tetra hybrid, also known as common species on domestic sericultural production.It is profit
With hybrid vigour, four cultivated silkworm breed varieties are by taking the Hybrid that (A × B) × (C × D) mating pattern is bred as.Two product
Plant and first carry out two-way cross generation double cross original seed, right latter two double cross original seed is hybridized generation tetra hybrid.Therefore, breed double
Hand over the main task that original seed is original strain of mulberry silkworm.
Preventing and treating double cross original seed germinal infection is the important leverage of silkworm egg production safety.But, pebrine disease also lacks
Special treatment method, is currently mostly by examining microsporidian to the female moth of spawning under the microscope, being picked according to microscopy result
Except poisonous silkworm egg, so as to prevent and treat the germinal infection of pebrine disease.However, this method and the experience and technology water of the malicious personnel of inspection
It is flat relevant, easily cause erroneous judgement and fail to judge.Therefore, the new method for finding preventing and treating pebrine disease germinal infection is always sericulture
The emphasis direction of scientific research.
The content of the invention
For this not perfect present situation of prevention and controls of silkworm double cross original seed germinal infection, it is an object of the invention to carry
For a kind of prevention and controls for double cross original seed granulosis germinal infection, this method is real by handling double cross original seed
Now inactivate the purpose of nosema bombycis in double cross original seed.The present invention's is simple to operate, practical, and compensate for Microscopical Method For Detection may
The situation of failing to judge occurred, is the useful supplement of Microscopical Method For Detection, the silkworm egg after processing is realized nontoxic substantially.
The purpose of the present invention is achieved through the following technical solutions:
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
Silkworm seed is without chilling treatment:Silkworm seed is treated into the embryo of silkworm seed in standing 15~24h at 20~30 DEG C after silkworm spawning
Fetal hair, which is educated, to be formed the phase to germ band and does next step processing again;Then silkworm seed is impregnated into 6~10min in 47~48 DEG C of water, impregnated
When should ensure that silkworm seed and solution are uniform, fully contact;It is eluted to clear water tasteless after silkworm seed is taken out, is then dried;
Silkworm seed is by chilling treatment:Silkworm seed is taken out from freezer, and several hours are stood at 10-20 DEG C as buffering,
6~10min of impregnation process in 47~50 DEG C of water is then placed in, should ensure that silkworm seed is uniform with solution, fully contact during dipping;Will
Silkworm seed is eluted to tasteless after taking out with clear water, is then dried;
The silkworm seed is double cross original seed;
Described several hours are preferred 1-3 hours.
Described water, preferably comprises acid or hydrogen peroxide;
Described acid is hydrochloric acid, sulfuric acid, nitric acid or acetic acid etc.;
The water containing hydrochloric acid, its density is 1.075-1.092g/cm3。
What the inventive method was leaned on is that water temperature kills microsporidian, but is needed for silkworm double cross original seed, water temperature and dip time
Grope and select.Water temperature is low to be not enough to kill microsporidian, and water temperature over-high then has an impact to the incubation rate of silkworm seed;During dipping
Between be also in this way, the time it is short be not enough to kill microsporidian, impregnate long and have an impact to the incubation rate of silkworm seed.The present invention is to this
Performing creative labour has been paid in the determination of two features, has obtained suitable scope, achieves good effect.Meanwhile, this hair
Bright dilute acid soln impregnates, and is conducive to releasing silkworm seed diapause, improves incubation rate.
The present invention has the following advantages and effect relative to prior art:
1st, the present invention to the relative prevention effect of double cross original seed pebrine disease semina vertical transmission up to 90~97%.
2nd, method Hatching Rate of Silkworm Eggs of the invention has no adverse effects up to more than 92% to Growth And Development of Silkworm.
Brief description of the drawings
Fig. 1 is influence of the dipping temperature to the double cross original seed incubation rate without chilling treatment.
Fig. 2 is influence of the dipping temperature to the double cross original seed incubation rate through chilling treatment.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
Embodiment 1
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, by silkworm seed in protecting 20h at 25 DEG C after spawning, be then placed in 47 DEG C, density be
1.075g/cm3Hydrochloric acid solution in impregnation process 10min, then take out elution, dry, hasten the hatching of silkworms, hatch.Practical incubation rate reaches
94%, 3 ages silkworm microscopic examination, compared with untreated control, with respect to prevention effect up to 95%.
Calculation formula with respect to prevention effect is as follows:
With respect to prevention effect (%)=(the 100- treatment groups incidence of disease/control group incidence of disease) × 100
Embodiment 2
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, by silkworm seed in protecting 20h at 25 DEG C after spawning, be then placed in 48 DEG C, density be
1.075g/cm3Hydrochloric acid solution in impregnation process 6min, then take out elution, dry, hasten the hatching of silkworms, hatch.Practical incubation rate reaches
93%, 3 ages silkworm microscopic examination, compared with untreated control, with respect to prevention effect up to 96%.
Embodiment 3
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, by silkworm seed in protecting 20h at 25 DEG C after spawning, be then placed in 47.5 DEG C, density be
1.075g/cm3Hydrochloric acid solution in impregnation process 8min, then take out elution, dry, hasten the hatching of silkworms, hatch.Practical incubation rate reaches
94%, 3 ages silkworm microscopic examination, compared with untreated control, with respect to prevention effect up to 97%.
Embodiment 4
In the case of other operation identicals, the reality of different dipping temperature solution is done to the silkworm seed of the cottonrose hibiscus of double cross original seed 9,7 Hunan
Test, investigate dipping temperature to not refrigerating the influence of double cross original seed Hatching Rate of Silkworm Eggs, as a result see Fig. 1.As can be seen that liquid temperature is more than 48
DEG C, Hatching Rate of Silkworm Eggs is remarkably decreased, therefore the temperature upper limit of dipping solution selects 48 DEG C.
Embodiment 5
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, it is stored refrigerated, silkworm seed is taken out from freezer and protects 2h under medium temperature (15 DEG C),
Be then placed in 47 DEG C, proportion be 1.092g/cm3Hydrochloric acid solution in impregnation process 10min, then take out elution, dry, urge
Blue or green, hatching.Practical incubation rate is up to the silkworm microscopic examination of 94%, 3 age, compared with untreated control, with respect to prevention effect up to 92%.
Embodiment 6
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, it is stored refrigerated, silkworm seed is taken out in (15 DEG C) protection 2h of medium temperature, so from freezer
After be put into 50 DEG C, proportion be 1.092g/cm3Hydrochloric acid solution in impregnation process 6min, then take out elution, dry, hasten the hatching of silkworms, incubate
Change.Practical incubation rate is up to the silkworm microscopic examination of 93%, 3 age, compared with untreated control, with respect to prevention effect up to 93%.
Embodiment 7
A kind of prevention and controls for silkworm double cross original seed granulosis germinal infection, comprise the following steps:
" Guangdong and Guangxi Provinces two " double cross original seed, it is stored refrigerated, silkworm seed is taken out in (15 DEG C) protection 2h of medium temperature, so from freezer
After be put into 48 DEG C, proportion be 1.092g/cm3Hydrochloric acid solution in impregnation process 8min, then take out elution, dry, hasten the hatching of silkworms, incubate
Change.Practical incubation rate is up to the silkworm microscopic examination of 94%, 3 age, compared with untreated control, with respect to prevention effect up to 95%.
Embodiment 8
In the case of other operation identicals, the reality of different dipping temperature solution is done to the silkworm seed of the cottonrose hibiscus of double cross original seed 9,7 Hunan
Test, investigate influence of the dipping temperature to refrigeration double cross original seed Hatching Rate of Silkworm Eggs, as a result see Fig. 2.As can be seen that liquid temperature is more than 50
DEG C, Hatching Rate of Silkworm Eggs is remarkably decreased, therefore the temperature upper limit of dipping solution selects 50 DEG C.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.