Ⅱ Pesticide soaking mosquito net
1. Objective
In order to strengthen the standardization of mosquito net soaking work. the measures of mosquito net soaking able to really play a role in reducing vector density, reducing humanmosquito contact and protecting health in the use area.
2. Preparation
(1)Organizational preparation
①Set up a technical guidance group for pesticide soaking mosquitonets composed of professional and technical personnel, which is responsible for training net soaking techniques, supervising and evaluating the quality of mosquitonets soaking.
②Take the natural village as a unit, set up a professional team of 3 to 5 people to soak the net. Complete the training of the team, which is responsible for registering the mosquitonet, preparing the pesticide solution, carrying out the net soaking and recording the soaking process.
③Popularize the knowledge of malaria control, publicize the significance of mosquito prevention and disease prevention to local residents. Mobilize the residents to actively cooperate with the implementation of the soaking work in the areas where soaking is carried out in combination with health education.
(2)Technical preparation
①Purchase uniform soaking pesticides and distribute them to relevant institutions.
②Register the number and size of mosquitonets (double or single), texture (cotton, nylon, linen, etc.), measure the area of mosquitonets and estimate the amount of water absorbed by each cage of mosquitonet.
③The area of mosquitonet is the sum of the surrounding area and the top area of each cage: total area of mosquitonet (m2) = front (width×height×2) + sides (width×height×2) + top (length×width).
④Estimate the water absorption of mosquitonets of different textures and sizes according to the following steps (if the mosquitonets have the same size and texture, select three of them to calculate).
Pour (Vi) volume of water into a large basin. Soak three mosquitonets of the same size and texture into the basin, rub them with hands. Soak them thoroughly. Then dry them slightly until the nets are not dripping.
Measur the remaining water in the basin (Vr)
Water absorption=(Vi - Vr)/3..........(Formula 6-6)
(3) Calculate the amount of insecticide needed
It is recommended that the dose of solution per square meter of mosquitonet is 25-30 mg (the dose varies with the solution)(https://www.daowen.com)
Example: When adopting 5% cyhalothrin. with the specification 1L/ bottle, the area of each double mosquitonet being 20 square meters, the dosage required for each square meter mosquitonet being 30 mg, then the dosage required for each mosquitonet is 30 mg×20 m2 = 600 mg. For 5% cyhalothrin with 1L/ bottle containing 50g cyhalothrin (50000 mg), the number of mosquitonets that can be soaked in a bottle of 5% cyhalothrin is 50000/600 = 83, that is to say 83 double mosquitonets or 16b single mosquitonets can be soaked in a bottle of 5% cyhalothrin.
3. Net soaking method
(1)The soaking time should be once a year before the peak season of the epidemic.
(2)Take the natural village as the unit. Soaked by the professional team.
(3)Prepare in advance water basins, buckets and gauges for soaking mosquitonets of different sizes and textures.
(4)The dosage of pesticide solution and the water absorption of mosquitonet are calculated according to the above method.
(5)Pour the liquid into the basin, add water to dilute and mix well.
(6)Put the washed and sun-dried mosquitonets into a water basin with prepared liquid pesticide, rub the nets with hands. Soak them all with the solution, take out and dry them with a little strenuous effort, until the solution does not drip off the nets. Dry them in a cool condition.
4. Matters needing attention
(1)Before soaking the mosquitonet, it should be washed and dried.
(2)The staff who soak the mosquitonet must wear rubber gloves in the process of rubbing the mosquitonet. After the operation, wash hands, face and other exposed parts with clean water.
(3) It is forbidden to distribute insecticides to residents for self-soaking.
(4) The soaking solution must be used currently. Moreover, it is appropriate to use one pot at a time.
(5)Dry the soaked mosquitonet in a shade environment; do not expose it to the sun directly.
(6)Do not wash the soaked mosquitonet within one year to keep the pesticide’s effect.
(7)In natural villages, the soaking rate of mosquitonets must reach more than 95%.