CO2 is easily provided by tanks, but tanked CO2 is very expensive compared to that provided by CO2 generators which burn propane or natural gas. (When Hardcore uses propane CO2 generators he uses
100-pound propane tanks instead of smaller tanks to avoid having to do a lot of refill work.)
The use of tanked CO2 can facilitate the killing of spider mites and other pests. In true sealed grow rooms that have no leaks, growers can kill all pests by upping CO2 levels to 10,000 parts per million (ppm) for one hour. Other CO2 augmentation methods
are incapable of generating 10,000 ppm for an hour ? only the tank supply method is capable of providing that concentration of CO2. Especially when using 10,000 ppm bug-killing tactics, growers must use safety methods that minimize the health problems
that CO2 can cause for humans.
http://can't link/articles/3368.html
Hydrocyanic Acid Gas. Hydrocyanic acid gas is extremely poisonous to all forms of life. It kills roaches, bedbugs, mosquitoes, fleas, flies, rats, mice, and other vermin with great certainty and very quickly. HCN also kills insect eggs, which sulphur dioxid and other gases fail to do. Hydrocyanic acid gas is not a germicide. It is not very poisonous to the higher forms of plant life. Hydrocyanic acid gas is much used in greenhouses for the destruction of insect pests and for scale and other parasites of fruit trees. The gas has a distinct place in the fumigation of granaries, stables, ships, barns, outhouses, railroad cars, and other uninhabited structures infested with vermin. It is also extensively used in flouring mills against weevils, in railroad cars against bedbugs, and in tobacco warehouses against insects in general. It should be used in the household only with the greatest precaution, as the least careless ness with it would probably mean the loss of human life. It has the marked advantage that it does not harm metals, fabrics, or pigments, and may be used in the most expensive drawing rooms.
Hydrocyanic acid gas is lighter than air and has an agreeable aromatic odor quite familiar in the flavoring essence of bittei almonds. The best method of generating it for the purpose of fumigation is by the action of dilute sulphuric acid upon potassium cyanid, in the fol lowing proportions: Sodium cyanid 1 ounce Potassium cyanid 1.0 ounce Sulphuric acid ounces Sulphuric acid 1.0 ounce Water 2 ounces Water 2.5 ounces The first step is to dilute the acid, which is done by adding the acid to water in a vitrified clay jar or receptacle capable of withstand ing the heat. The whole amount of cyanid should be put into the acid at once. As the evolution of the gas is rapid, the operator should be ready to leave the spot without delay. As pointed out by Fulton, it is convenient to tie the cyanid up in a bag made of cheese cloth or tissue paper, which is lowered into the acid by a cord passing outside of the room. The amount of gas used for fumigation, expressed in terms of cyanid, is from ounce to 10 ounces per 100 cubic feet of space. From 30 minutes to 2 hours will kill lice, bedbugs and roaches, but in practice an exposure of 2 to 6 hours is advisable (page 514). Hydro cyanic acid gas is quite as effective as sulphur dioxid, is not destructive, is reasonably cheap, and is certain in its action, but its poisonous nature is such a serious drawback that it has a limited place as an insecticide in public health work. It is finding favor in maritime quar antine practice, where it is largely replacing SO,. See pages 515 and 1402.
http://www.booksupstairs.com/Preventive-Medicine-and-Hygiene/Insecticides.html
There is a CO2 thread here (actually several):
One best post was #3:
"CO2 is not flammable at all. It is actually used in metal shops and closed welding chambers to create a CO2 rich atmosphere that will inhibit anything that wants to burn.
I do CO2 bombs almost every week! They are very effective. It is wise to do it during the dark period, when the plants' stomates are closed, as anything over 2,000 ppm CO2 is toxic to the plants, and anything over 4,000 ppm CO2 is toxic to humans. It is almost impossible to reach these levels of CO2 in a large room with a CO2 burner, you must use a 50 lb. tank. Turn off all your ventilation and circulation, fans, AC, etc. I would just stand the tank in the middle of the room, crack open the valve 1/4 turn, and come back in 1+ hour(s), air the room out before the lights come back on.
I think you will find that the CO2 method is more effective, if done properly, where pests can build a tolerance to the Pyrethrum. Not to mention, the CO2 method is much more healthy, as it leaves zero residue on the final product, and can be done right up until the last day of flower! "
Now, the thing is, Ditylenchus dipsaci have no respiratory system, so not sure if this would effect them. I believe they must need oxygen though, so if it was all displaced, they should die at some point.
100-pound propane tanks instead of smaller tanks to avoid having to do a lot of refill work.)
The use of tanked CO2 can facilitate the killing of spider mites and other pests. In true sealed grow rooms that have no leaks, growers can kill all pests by upping CO2 levels to 10,000 parts per million (ppm) for one hour. Other CO2 augmentation methods
are incapable of generating 10,000 ppm for an hour ? only the tank supply method is capable of providing that concentration of CO2. Especially when using 10,000 ppm bug-killing tactics, growers must use safety methods that minimize the health problems
that CO2 can cause for humans.
http://can't link/articles/3368.html
Hydrocyanic Acid Gas. Hydrocyanic acid gas is extremely poisonous to all forms of life. It kills roaches, bedbugs, mosquitoes, fleas, flies, rats, mice, and other vermin with great certainty and very quickly. HCN also kills insect eggs, which sulphur dioxid and other gases fail to do. Hydrocyanic acid gas is not a germicide. It is not very poisonous to the higher forms of plant life. Hydrocyanic acid gas is much used in greenhouses for the destruction of insect pests and for scale and other parasites of fruit trees. The gas has a distinct place in the fumigation of granaries, stables, ships, barns, outhouses, railroad cars, and other uninhabited structures infested with vermin. It is also extensively used in flouring mills against weevils, in railroad cars against bedbugs, and in tobacco warehouses against insects in general. It should be used in the household only with the greatest precaution, as the least careless ness with it would probably mean the loss of human life. It has the marked advantage that it does not harm metals, fabrics, or pigments, and may be used in the most expensive drawing rooms.
Hydrocyanic acid gas is lighter than air and has an agreeable aromatic odor quite familiar in the flavoring essence of bittei almonds. The best method of generating it for the purpose of fumigation is by the action of dilute sulphuric acid upon potassium cyanid, in the fol lowing proportions: Sodium cyanid 1 ounce Potassium cyanid 1.0 ounce Sulphuric acid ounces Sulphuric acid 1.0 ounce Water 2 ounces Water 2.5 ounces The first step is to dilute the acid, which is done by adding the acid to water in a vitrified clay jar or receptacle capable of withstand ing the heat. The whole amount of cyanid should be put into the acid at once. As the evolution of the gas is rapid, the operator should be ready to leave the spot without delay. As pointed out by Fulton, it is convenient to tie the cyanid up in a bag made of cheese cloth or tissue paper, which is lowered into the acid by a cord passing outside of the room. The amount of gas used for fumigation, expressed in terms of cyanid, is from ounce to 10 ounces per 100 cubic feet of space. From 30 minutes to 2 hours will kill lice, bedbugs and roaches, but in practice an exposure of 2 to 6 hours is advisable (page 514). Hydro cyanic acid gas is quite as effective as sulphur dioxid, is not destructive, is reasonably cheap, and is certain in its action, but its poisonous nature is such a serious drawback that it has a limited place as an insecticide in public health work. It is finding favor in maritime quar antine practice, where it is largely replacing SO,. See pages 515 and 1402.
http://www.booksupstairs.com/Preventive-Medicine-and-Hygiene/Insecticides.html
There is a CO2 thread here (actually several):
One best post was #3:
"CO2 is not flammable at all. It is actually used in metal shops and closed welding chambers to create a CO2 rich atmosphere that will inhibit anything that wants to burn.
I do CO2 bombs almost every week! They are very effective. It is wise to do it during the dark period, when the plants' stomates are closed, as anything over 2,000 ppm CO2 is toxic to the plants, and anything over 4,000 ppm CO2 is toxic to humans. It is almost impossible to reach these levels of CO2 in a large room with a CO2 burner, you must use a 50 lb. tank. Turn off all your ventilation and circulation, fans, AC, etc. I would just stand the tank in the middle of the room, crack open the valve 1/4 turn, and come back in 1+ hour(s), air the room out before the lights come back on.
I think you will find that the CO2 method is more effective, if done properly, where pests can build a tolerance to the Pyrethrum. Not to mention, the CO2 method is much more healthy, as it leaves zero residue on the final product, and can be done right up until the last day of flower! "
Now, the thing is, Ditylenchus dipsaci have no respiratory system, so not sure if this would effect them. I believe they must need oxygen though, so if it was all displaced, they should die at some point.
