Insecticidal compositions having improved effect

1. Composition comprising

spirotetramat

and at least one salt of formula (II)

in which

D is nitrogen or phosphorus,

R 26 , R 27 , R 28 and R 29 independently of one another are hydrogen or in each case optionally substituted C 1 -C 8 -alkyl or singly or multiply unsaturated, optionally substituted C 1 -C 8 -alkylene, the substituents being selectable from the group consisting of halogen, nitro and cyano,

n is 1, 2, 3or 4,

R 30 is an organic or inorganic anion.

2. Composition according to claim 1 , wherein the spirotetramat content is between 0.5% and 50% by weight.

3. Composition according to claim 1 , wherein the amount of salt is between 0.5 and 80 mmol/l.

4. Composition according to claim 1 , wherein D is nitrogen.

5. Composition according to claim 4 , wherein R 30 is hydrogencarbonate, tetraborate, fluoride, bromide, iodide, chloride, monohydrogenphosphate, dihydrogenphosphate, hydrogensulphate, tartrate, sulphate, nitrate, thiosulphate, thiocyanate, formate, lactate, acetate, propionate, butyrate, pentanoate, citrate or oxalate.

6. Composition according to claim 4 , wherein R 30 is carbonate, pentaborate, sulphite, benzoate, hydrogenoxalate, hydrogencitrate, methylsulphate or tetrafluoroborate.

7. Composition according to claim 4 , wherein R 30 is lactate, sulphate, nitrate, thiosulphate, thiocyanate, citrate, oxalate or formate.

8. Composition according to claim 4 , wherein R 30 is thiocyanate, dihydrogenphosphate, monohydrogenphosphate or sulphate.

9. Composition according to claim 1 , further comprising at least one penetrant.

10. Composition according to claim 9 , wherein the penetrant is i) a fatty alcohol alkoxylate of the formula (III)

R—O-(-AO) v —R′  (III)

in which

R is linear or branched alkyl having 4 to 20 carbon atoms,

R′ is hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl or n-hexyl,

AO is an ethylene oxide radical, a propylene oxide radical, a butylene oxide radical or is mixtures of ethylene oxide and propylene oxide radicals or butylene oxide radicals, and

v is a number from 2 to 30,

and/or ii) a mineral or vegetable oil and/or iii) an ester of a mineral or vegetable oil.

11. Composition according to claim 9 , wherein the penetrant is an ester of a vegetable oil.

12. Composition according to claim 9 , wherein the penetrant is rapeseed oil methyl ester.

13. Composition according to claim 9 , wherein the amount of penetrant is 1% to 95% by weight.

14. Method of controlling parasitic insects and/or spider mites, comprising applying a composition according to claim 1 , undiluted or diluted to an insect and/or spider mite or a habitat thereof in an amount such that an effective amount of spirotetramat acts on the insect and/or spider mite or said habitat.

15. Method of boosting the activity of spirotetramat comprising applying the composition of claim 1 , wherein the composition comprises an application-ready spray liquor.

16. Method according to claim 15 , wherein the spray liquor is prepared using a penetrant.

17. Method according to claim 15 , wherein the salt of the formula (II) is present in a final concentration of 0.5 to 80 mmol/l.

18. Method according to claim 16 , wherein the penetrant is present in a concentration of 0.1 to 10 g/l.

19. Method according to claim 16 , wherein the penetrant is present in a concentration of 0.1 to 10 g/l and the salt of the formula (II) in a concentration of 0.5 to 80 mmol/l.

20. A composition for boosting the activity of spirotetramat comprising a composition of claim 1 , wherein said composition is in the form of an application-ready spray liquor.

21. A composition according to claim 20 , wherein, in the application-ready spray liquor the salt of the formula (II) is present in a concentration of 0.5 to 80 mmol/l.

22. A composition according to claim 20 , further comprising a penetrant.