Extended release formulation

1. A method of making an extended release insecticide formulation, the method comprising:

i) admixing an insecticide with a lipophilic wax with optional heating to form an admixture of insecticide and lipophilic wax, wherein the insecticide is methoprene;

ii) contacting the admixture of insecticide and lipophilic wax to a substrate to form a matrix;

iii) admixing a water erodible powder, wherein the water erodible powder is calcium sulfate, a release retarding polymer, and a rate extending polymer together to uniformly embed into the matrix and form a powder;

iv) adding a binder with water to the powder to form a dough; and

v) forming a granule from the dough using a granulator, wherein the erodible powder and the rate extending polymer form a water insoluble calcium alginate within the formulation.

2. The method of claim 1 , wherein the insecticide is present between 0.1% to 20% w/w.

3. The method of claim 1 , wherein the substrate is silica.

4. The method of claim 1 , wherein the lipophilic wax is a member selected from the group consisting of an animal wax, a vegetable wax, a petroleum wax, a hydrogenate vegetable oil, or a polyethylene polymer.

5. The method of claim 1 , wherein the lipophilic wax is present in about 1% to about 20% w/w.

6. The method of claim 1 , wherein the release retarding polymer is a member selected from the group consisting of guar gum, xanthan gum, polyurethanes, gelatins, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydroxypropylethylcellulose, and a combination thereof.

7. The method of claim 6 , wherein the release retarding polymer is xanthan gum.

8. The method of claim 1 , wherein the binder is polyvinyl alcohol (PVA).

9. The method of claim 1 , wherein the release retarding polymer is present from about 1% to about 20% w/w.

10. The method of claim 1 , wherein the rate extending polymer is present from about 1% to about 10% w/w.

11. A method of making an extended release insecticide formulation for water applications, the method comprising:

i) admixing methoprene with a melted lipophilic wax to form a liquid admixture of insecticide and lipophilic wax;

ii) spraying the liquid admixture of methoprene and lipophilic wax onto a substrate to form a matrix;

iii) admixing calcium sulfate, a release retarding polymer, and a rate extending polymer together with the matrix to form a powder in which the matrix is uniformly embedded with calcium sulfate, the release retarding polymer, and the rate extending polymer;

iv) adding a binder with water to the powder to form a dough; and

v) forming a granule from the dough using a granulator, wherein the erodible powder and the rate extending polymer form a water insoluble calcium alginate within the formulation, which formulation is for use in water.

12. The method of claim 11 , wherein the lipophilic wax is a member selected from the group consisting of an animal wax, a vegetable wax, a petroleum wax, a hydrogenate vegetable oil, and a polyethylene polymer; and wherein the lipophilic wax is present in about 1% to about 20% w/w.

13. The method of claim 11 , wherein the substrate is silica.

14. The method of claim 11 , wherein the release retarding polymer is a member selected from the group consisting of guar gum, xanthan gum, polyurethanes, gelatins, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxyethylmethylcellulose, hydroxypropylethylcellulose, and a combination thereof.

15. The method of claim 11 , wherein calcium sulfate is present from about 50% to about 85% w/w.

16. The method of claim 1 , wherein the rate extending polymer is sodium alginate.

17. The method of claim 1 , wherein the rate extending polymer is alginic acid.