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Table 2 Activities of insecticide detoxifying enzymes in An.subpictus sibling species in different districts

From: Variations in susceptibility to common insecticides and resistance mechanisms among morphologically identified sibling species of the malaria vector Anopheles subpictus in Sri Lanka

District

Species

aAChE (%)

bGST

cEst

dMO

eMCE

  

< 30 [SS]

30-70 [RS]

> 70 [RR]

    

Trincomalee

B/An. sundaicus s.l.

56

38

6

55

33

0

+

 

C

25

40

35

49

42

0

++

 

D

47

43

10

54

32

0

++

Batticaloa

B/An. sundaicus s.l.

53

44

3

27

36

0

+

 

C

39

29

32

32

51

0

++

 

D

40

34

26

23

42

0

++

Ampara

B/An. sundaicus s.l.

70

24

6

18

16

0

_

 

C

47

25

28

53

58

0

++

 

D

56

23

21

50

42

0

++

Puttalam

B/An. sundaicus s.l.

63

31

6

29

22

0

+

 

C

44

36

20

40

58

0

++

 

D

41

28

31

48

54

0

++

  1. aHomozygous sensitive (SS), heterozygous (RS) and homozygous insensitive (RR) are given according to the percentage remaining activity of AChEs in individual mosquitoes after insecticide inhibition [27].
  2. b % population having glutathione S-transferase (GST) specific activity above 0.40 μmol/mg/min [19].
  3. c % population having esterase (Est) specific activity above 0.25 μmol/mg/min [19].
  4. d % population having monooxygenase (MO) levels above 0.35 per mg protein of cytochrome P450[19]
  5. e malathion carboxyesterase (MCE) activity as measured by malathion metabolism studies:- no activity, +- moderate activity (production of only either mono-acid or di-acid), ++-high activity (production of both mono-acid and di-acid).