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Table 3 The susceptibility of the bacteria isolated from insect guts and corresponding type strains to the plant extracts

From: Antibiotic-resistant bacteria in the guts of insects feeding on plants: prospects for discovering plant-derived antibiotics

Insect species

Food plant

Bacterial species

Zone of inhibition [mm]

Crude leaf

Crude flower

Crude root

HPLC fraction

gut

type

gut

type

gut

type

gut

type

Giant Lime Green Stick insect

(Diaphroedes gigantea)

Eucalyptus

(Eucalyptus dalyrympleana)

Ba. amyloliquefaciens

0

0

    

0

0

M. oxydans

7

4

    

12

10

Sp. multivorum

10

17

    

7

14

Diamondback moth

(Plutella xylostella)

Chinese Cabbage

(Brassica rapa)

Sa. keddieii

0

0

      

Ra. terrigena

0

0

      

Cinnabar moth

(Tyria jacobeae)

Ragwort

(Jacobaea vulgaris)

K. rhizophila

23

25

      

Ba. licheniformis

27

27

      

St. epidermidis

23

21

      

St. warneri

18

16

      

Bu. fungorum

23

18

      

Rosemary beetle

(Chrysolina americana)

Lavender

(Lavendula augustifolia)

M. foliorum

7

6

10

10

    

M. gubbeenense

6

6

11

10

    

Rho. erythropolis

0

0

10

10

    

St. epidermidis

0

0

10

12

    

Pa. agglomerans

0

0

12

12

    

Death’s-head Hawkmoth

(Acherontia atropos)

Potato

(Solanum tuberosum)

E. asburiae

7

7

      

Ps. putida

6

6

      

Ra. terrigena

10

7

      

Beet Armyworm

(Spodoptera exigua)

Madagascar Periwinkle

(Catharansus roseus)

M. paraoxydans

8

6

  

28

20

  

Ba. aquimaris,

6

6

  

16

0

  

Ba. vietnamensis,

6

6

  

17

0

  

Rhi. pusense

6

7

  

17

20

  
  1. The values were obtained in a disc diffusion assay; the discs carried 10 μg dried extract, the assay was repeated three times