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 Storing live 'brownies' over winter 
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Joined: Fri Apr 26, 2013 4:40 pm
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Location: Olympia, WA
Post Storing live 'brownies' over winter
A previous thread on optimum temperatures for storing larvae over winter came up with a temp range of 50-55ºF.

Elsewhere, I ran across a brief suggestion for storing mealworms, and wondered if it would be a good idea to do the same with BSF.

It suggested using bran (available cheap from food bulk bins), dry or dampened. What's your feeling on this? Would some moisture be a benefit, or a hindrance?

Sue


Tue Aug 27, 2013 3:39 pm
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Post Re: Storing live 'brownies' over winter
I think it might be a good idea to avoid using food as a medium, but bran isn't really food I guess. I think coir or sawdust would work just as well and be cheaper. I've never overwintered mature larvae so my opinion is not even worth $.02. :)

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Tue Aug 27, 2013 6:43 pm
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Post Re: Storing live 'brownies' over winter
They definitely need moisture or they'll dry out. Try to mimic nature, larvae and pupae are know to survive the moderate winters in compost piles. Based on that, I think 45 F degrees is the target temp.

Avoid substrates with really fine powder, this might clog their respiratory system and cause them to suffocate.


Wed Aug 28, 2013 12:54 am
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Post Re: Storing live 'brownies' over winter
BelgianPup wrote:
A previous thread on optimum temperatures for storing larvae over winter came up with a temp range of 50-55ºF.

Elsewhere, I ran across a brief suggestion for storing mealworms, and wondered if it would be a good idea to do the same with BSF.

It suggested using bran (available cheap from food bulk bins), dry or dampened. What's your feeling on this? Would some moisture be a benefit, or a hindrance?

Sue


Hi Sue
I have just gone through winter and I stored the pupae indoors +- 10-20 degrees Celsius in a polystyrene cooler box...dry just the pupae and all went well.
all the pupae are still alive and if I move them they are very active.
I have through winter had a few fly pupate but 99.99999 of the pupae are ready to pupate...now summers coming on...worked well


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Wed Aug 28, 2013 10:47 am
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Post Re: Storing live 'brownies' over winter
francois wrote:
... I stored the pupae indoors +- 10-20 degrees Celsius in a polystyrene cooler box...dry just the pupae and all went well.
all the pupae are still alive and if I move them they are very active.
I have through winter had a few fly pupate but 99.99999 of the pupae are ready to pupate...now summers coming on...worked well
Very interesting and thanks for posting that. Any idea what the ambient humidity was?

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Wed Aug 28, 2013 11:21 am
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Post Re: Storing live 'brownies' over winter
BorealWormer wrote:
francois wrote:
... I stored the pupae indoors +- 10-20 degrees Celsius in a polystyrene cooler box...dry just the pupae and all went well.
all the pupae are still alive and if I move them they are very active.
I have through winter had a few fly pupate but 99.99999 of the pupae are ready to pupate...now summers coming on...worked well
Very interesting and thanks for posting that. Any idea what the ambient humidity was?


I copied this from a weather site, it gives all you all averages for a time period req.....
average temps humidity.....
hope this helps and gives a good idea conditions

francois


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This report describes the typical weather at the Port Elizabeth Airport (Port Elizabeth, South Africa) weather station over the course of an average year. It is based on the historical records from 1994 to 2012. Earlier records are either unavailable or unreliable.

Port Elizabeth has a mild humid temperate climate with warm summers and no dry season. The area within 40 km of this station is covered by oceans and seas (63%), grasslands (19%), croplands (8%), forests (7%), and built-up areas (4%).

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The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
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The average fraction of time spent in various temperature bands: frigid (below -9°C), freezing (-9°C to 0°C), cold (0°C to 10°C), cool (10°C to 18°C), comfortable (18°C to 24°C), warm (24°C to 29°C), hot (29°C to 38°C) and sweltering (above 38°C).
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The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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The median cloud cover ranges from 29% (mostly clear) to 63% (partly cloudy). The sky is cloudiest on January 31 and clearest on July 2. The clearer part of the year begins around April 25. The cloudier part of the year begins around September 7.

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The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).
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On January 31, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 54% of the time, and clear or mostly clear 36% of the time.

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The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.
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The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 12, occurring in 47% of days. Precipitation is least likely around May 25, occurring in 29% of days.

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Moderate rain is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around November 22, when it is observed during 20% of all days.

Light rain is the most severe precipitation observed during 34% of those days with precipitation. It is most likely around November 5, when it is observed during 16% of all days.

Thunderstorms are the most severe precipitation observed during 11% of those days with precipitation. They are most likely around March 24, when it is observed during 7% of all days.

Types of Precipitation Throughout the Year
Relative frequency of various types of precipitation over the course of a typical year.

During the warm season, which lasts from December 27 to March 18, there is a 43% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (39% of days with precipitation have at worst moderate rain), light rain (31%), thunderstorms (14%), and drizzle (13%).

During the cold season, which lasts from May 28 to October 7, there is a 34% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (51% of days with precipitation have at worst moderate rain), light rain (36%), thunderstorms (6%), and drizzle (5%).

Warm Season PrecipitationCold Season PrecipitationRelative frequency of various types of precipitation during the warm and cold seasons respectively. Snow
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.

Humidity
The relative humidity typically ranges from 43% (comfortable) to 96% (very humid) over the course of the year, rarely dropping below 20% (dry) and reaching as high as 100% (very humid).

The air is driest around July 9, at which time the relative humidity drops below 57% (mildly humid) three days out of four; it is most humid around March 25, exceeding 93% (very humid) three days out of four.

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The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).
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The highest average wind speed of 6 m/s (moderate breeze) occurs around October 30, at which time the average daily maximum wind speed is 10 m/s (fresh breeze).

The lowest average wind speed of 4 m/s (gentle breeze) occurs around July 12, at which time the average daily maximum wind speed is 8 m/s (moderate breeze).

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Wind Directions Over the Entire Year
The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.
Fraction of Time Spent with Various Wind Directions
The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.

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Wed Aug 28, 2013 12:55 pm
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Post Re: Storing live 'brownies' over winter
francois wrote:
Humidity
The relative humidity typically ranges from 43% (comfortable) to 96% (very humid) over the course of the year, rarely dropping below 20% (dry) and reaching as high as 100% (very humid).

The air is driest around July 9, at which time the relative humidity drops below 57% (mildly humid) three days out of four; it is most humid around March 25, exceeding 93% (very humid) three days out of four.
Thanks francois. Folks in drier climates might have to supplement their humidity to achieve your conditions.

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Wed Aug 28, 2013 2:38 pm
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Post Re: Storing live 'brownies' over winter
Francois,

Thank you very much for the information! It's encouraging to hear that someone has actually kept them over winter.

So your temps ranged from 50-68ºF, with high natural humidity in winter.

I just looked up my historical cooler weather info, and the outdoor temps range from 32°F to 43°F, with relative humidity from 44% to 98%, so that isn't far off from yours.

I think I can do this!

Sue


Thu Aug 29, 2013 3:14 pm
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