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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