Draft Conditions for Import of Maize Seed s B.E….(….)  Page 1 of 8 
 (Unofficial Translation)  
 
Notification of Department of Agriculture  
Re: Conditions for Import of Maize  Seed s B.E. … (…) 
 
     
 
 The Department of Agriculture has completed pest risk analysis for commercial 
importation of  maize seeds.   
 By virtue of the provisions of Section 8(2) and Section 10 of the Plant Quarantine Act 
B.E. 2507 (1964) amended by the Plant Quarantine Act (No.3) B.E. 2551 (2008)  The Director -
General of Department of Agriculture through the recommendation of the Plant Quarantine 
Committee hereby announces  phytosanitary import requirements of  maize seeds for sowing as 
follow:  
1. This notification shall be called “Notification of Department of Agriculture,  Re: 
Condi tions for Import of Maize S eeds B.E. … (…).” 
2. This notification shall come into force as from sixty days  following the date of its 
publication in the Government Gazette .1   
3. The Notification of Department of Agriculture, Re: Conditions for Import of Maize 
Seeds B.E. 2563 (2020) dated 30 November B.E. 2563 (2020) shall be repealed.  
4. The Notification of Department of Agriculture, Re: Conditions for Import of Maize 
Seeds ( No.2) B.E. 2564 (202 1) dated 5 March B.E. 256 4 (2021) shall be repealed.  
5. Permitted Plant S pecies  
Maize ( Zea mays ) seeds  
6. Permitted C ountry  
 All countries  
7. Quarantine P ests of Concern  
A list of quarantine pests of concern to the Kingdom of Thailand for maize  seeds is 
given in the Annex  1. 
8. Import Permit  
Import permit issued by the Department of Agriculture (DOA) is required.  
 
     
 
 1 Published in the Government Gazette Vol. .., Part .., Page .., .. .... B.E. .... (....)  
 
 
This translation is provided by Department of Agriculture  as the competent authority for 
information purposes only. Whilst Department of Agriculture  has made efforts to ensure the 
accuracy and correctness of the translation, the original Thai text as formally adopted and 
published shall in all events remain the sole authoritative text having the force of law.  
  
Draft Conditions for Import of Maize Seeds B.E.... (...)  Page 2 of 8 
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9. Means of C onveyance  
Maize  seeds must  be imported from a  port in any country  to a port in the Kingdom of 
Thailand  by air cargo  or sea cargo  or land cargo .  
10. General Requirements   
(1) Maize  seeds must be  non-genetically modified organism s. 
(2) Maize seeds must be packed in  new, clean packaging  and free of live insects,  
contamina tion (e.g. contaminant seeds, leaf , stem materials, soil, sand etc. ) or other 
potential carriers of quarantine pests.    
11. Specific Requirements  
(1) Maize  seed lots are required to fulfill one of the following phytosanitary 
 import conditions, and/or a combination of the three  conditions addressing each of 
then twenty -one quarantine pests  i.e. Clavibacter nebraskensis,  Pantoea stewartii 
subsp.  stewartii, Pseudomonas syringae pv. lapsa, Pseudomonas syringae pv. 
syringae, Xanthomonas vasicola pv. vasculorum , High plains virus , Wheat 
streak mosaic virus , Bipolaris maydis race T , Fusarium culmorum, Harpophora 
maydis,  Peronosclerospora heteropogoni,  Peronosclerospora philippinensis,  
Sclerophthora macrospora, Sclerophthora rayssiae var. zeae,  Sclerospora 
graminicola, Sporisorium reilianum , Stenocarpella macrospora , Striga 
angustifolia, Striga aspera, Striga densiflora and Striga hermonthica . 
        (a) Maize seeds  were produced in a country where the quarantine pests in 
 Section 11 (1) are not known to occur . OR  
(b) Maize  seeds  were derived from parent plants that were inspected and t ested 
during the growing season  and found free from the quarantine pests in  Section 
11 (1). OR 
(c) Maize seeds were officially tested and found free from the quarantine pests 
in Section 11 (1). 
 (2) Maize seeds must be dressed with appropriate  fungicides .     
12. Phytosanitary Certification    
(1) A phytosanitary c ertificat e or a phytosanitary certificate  for re -export issued by 
the National Plant Protection  Organization  from the exporting country  is 
require d. The original copy  must accompany every  consignment to the Kingdom 
of Thailand and bear one the following additional declaration, and/or a 
combination of the three declarations addressing each of the twenty -one 
quarantine pests .  
(a)  “The consignment of maize  seeds was produced  in [insert name of country]  where 
Clavibacter nebraskensis, Pantoea stewartii subsp.  stewartii, Pseudomonas 
syringae pv. lapsa, Pseudomonas syringae pv. syringae, Xanthomonas vasicola pv. 
vasculorum , High plains virus , Wheat streak mosaic virus, Bipolaris maydis race T , 
Fusarium culmorum, Harpophora maydis,  Peronosclerospora heteropogoni, 
Peronosclerospora philippinensis,  Sclerophthora macrospora, Sclerophthora 
rayssiae var. zeae, Sclerospora graminicola, Sporisorium reilianum, Stenocarpella  
Draft Conditions for Import of Maize Seeds B.E.... (...)  Page 3 of 8 
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macrospora, Striga angustifolia, Striga aspera, Striga densiflora and Striga 
hermonthica are not known to occur. ”  
   OR  
(b)  “The consignment of maize  seeds was derived from parent plants that were inspected 
and tested during the growing season and found free from Clavibacter nebraskensis, 
Pantoea stewartii subsp.  stewartii, Pseudomonas syringae pv. lapsa, Pseudomonas 
syringae pv. syringae, Xanthomonas vasicola pv. vasculorum , High plains virus , 
Wheat streak mosaic virus , Bipolaris maydis race T , Fusarium culmorum, 
Harpophora maydis,  Peronosclerospora heteropogoni, Peronosclerospora 
philippinensis,  Sclerophthora macrospora, Sclerophthora rayssiae var. zeae, 
Sclerospora graminicola, Sporisorium reilianum, Stenocarpella macrospora, Striga 
angustifolia, Striga aspera, Striga densiflora and Striga hermonthica .” 
   OR 
(c) “The consignment of maize seeds was officially tested and found free from 
Clavibacter nebraskensis, Pantoea stewartii subsp.  stewartii, Pseudomonas 
syringae pv. lapsa, Pseudomonas syringae pv. syringae, Xanthomonas vasicola pv. 
vasculorum , High plains virus , Wheat streak mosaic virus , Bipolaris maydis race T , 
Fusarium culmorum, Harpophora maydis,  Peronosclerospora heteropogoni, 
Peronosclerospora philippinensis,  Sclerophthora macrospora, Sclerophthora 
rayssiae var. zeae, Sclerospora graminicola, Sporisorium reilianum, Stenocarpella 
macrospora, Striga angustifolia, Striga aspera, Striga densiflora and Striga 
hermonthica .” 
(2) Information on fungici de treatment (fungicide common name and percent active 
ingredient) must be indicated in the appropriate sections of a phytosanitary 
certificate  or a phytosanitary certificate  for re -export . 
 
13. Import inspection   
(1) When the consignments  arrive at the point of entry in the Kingdom of Thailand,  
the import inspection must be conducted after confirming the respective documents  
accompanying the consignments concerned.  
(2) DOA reserved the right to have the consignment re-exported or destroyed at the 
importer’s expenses, if non -compliance with documentary or phytosanitary 
import requirements is identified.  
(3) If the phytosanitary certificate or a phytosanitary certificate for re -export does 
not specify details of the fungicide treatment , the consignment must be re -
exported or destroyed  at the importer’s expense.  
(4) All consignments must be inspected for the presence of live insects, disease 
symptoms  and contamina tion (contaminant seeds, leaf , stem materials , soil, 
sand) when arrive at the point of entry in the Kingdom of Thailand. 
Subsequently, a representative sample must be drawn and submitted a 
designated laboratory for further analysis. The consignment must be held under 
quarantine pending results of the analysis.   
(5) If genetically modified maize  seeds are found, the consignment must be               
re-exported or destroyed at the importer’s expenses.  
  
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(6) If the quarantine pests in Section 11 (1) are found during import inspection, the 
consignment must be re -exported or destroyed  at the importer’s expense.  
(7) If quarantine pests of Thailand concern as stipulate in the Annex  1 are found, 
the consignment must be treated with an appropriate treatment (if available),  
re-exported or destroyed at the importer’s expenses.  
(8) If the consignments are frequently found to be non -compliance with 
phytosanitary import requirements or other cases, DOA may suspend, terminate 
or impose additional specific import conditions from a certain country as  
follows:   
 (a) Import of m aize seeds from the Union of Myanmar  must comply with the 
additional conditions as the Annex 2 of this notification.  
(9) If any live organism of potential quarantine concern to Thailand not listed in  the 
Annex  1 is found, the consignment shall  be treated with an appropriate treatment 
(if available), re -exported or destroyed  at the importer’s  expenses. The DOA 
reserved the right to temporary suspension of import  from the identified  pathway 
until a risk assessment of intercepted organisms  is determined.  
(10) All applications (Application for Permit to Import Prohibited Articles for 
 Commercial Purposes (Form P.Q 2)) and Permits (Permit to Import Prohibited 
Articles for Commercial Purposes under the Plant Quarantine Act B.E. 2507 and 
amended (Form P.Q 2 -1)) which are in the process and have not completed yet 
or have already completed on the day before this notification enters into force, 
they are still effective until the  expiration date or a new action under this 
notification, depending on the case.  
                                  
   Issued on ………………….  
 
                    
Director -General  
                          Department of Agriculture  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Draft Conditions for Import of Maize Seeds B.E.... (...)  Page 5 of 8 
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Annex  1 
 
List of Quarantine Pests of  Maize  Seeds 
Attached to the Notification of Department of Agriculture  
Re: C onditions for Import of Maize Seeds B.E. …. (….)  
 
Scientific name  Common name  
Insect   
 Order Coleoptera   
  Family Bostrichidae   
   Prostephanus truncatus  larger grain borer  
  Family Cucujidae   
   Cryptolestes pusillus  flat grain beetle  
  Family Curculionidae   
   Caulophilus oryzae  broad nosed grain weevil  
   Graphognatus leucoloma  white -fringed weevil  
  Family  Languriidae   
   Pharaxonotha kirschii  Mexican grain beetle  
  Family  Ptinidae   
   Gibbium psylloides  shiny spider beetle  
  Family  Silvanidae   
   Cathartus quadricollis  square -necked flour beetle  
  Family  Tenebrionidae   
   Cyaneus angustus  large black flour beetle  
  Family  Dermestidae   
   Trogoderma glabrum  colored cabinet beetle  
   Trogoderma granarium  khapra beetle  
   Trogoderma inclusum  larger cabinet beetle  
   Trogoderma ornatum  ornate cabinet beetle  
   Trogoderma variabile  grain dermestid, warehouse 
beetle  
   Trogoderma versicolor  trogoderma dermestid beetle  
Pathogens   
 Bacteria   
   Clavibacter nebraskensis  Goss's bacterial wilt & leaf 
blight  
   Dickeya paradisiaca  rhizome rot  
   Enterobacter dissolvens  stalk rot  
   Erwinia carotovora pv. atroseptica  potato blackleg disease  
   Pantoea stewartii  subsp.  stewartii  bacterial wilt of maize  
   Pseudomonas rubrisubalbicans  mottled stripe of sugarcane  
   Pseudomonas syringae pv. coronafaciens  chocolate spot, halo blight  
   Pseudomonas syringae pv. lapsa  bacterial stalk rot  
   Pseudomonas syringae pv. striafaciens  bacterial: barley black node  
   Pseudomonas syringae pv. syringae  Holcus spot, bacterial canker or blast  
   Pseudomonas viridiflava  bacterial leaf blight of tomato  
   Xanthomonas vasicola pv. vasculorum  bacterial leaf streak  
 Fungi   
   Bipolaris maydis race T  Southern corn leaf blight   
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Scientific name  Common name  
   Cercospora zeae -maydis  grey leaf spot  
   Claviceps gigantea  horse's tooth  
   Cochliobolus ravenelii  false smut  
   Fusarium culmorum  culm rot: cereals  
   Harpophora maydis  black bundle disease  
   Kabatiella zeae  eyespot  
   Mycosphaerella zeae -maydis  yellow leaf blight of maize  
   Peronosclerospora heteropogoni  Rajasthan downy mildew  
   Peronosclerospora philippinensis  Philippine downy mildew  
   Pestalosphaeria gubae  chlorotic spot  
   Phaeocytostroma ambiguum  stalk rot and root rot  
   Phaeosphaeria maydis  leaf spot of sorghum  
   Physalospora zeicola  physalospora ear rot  
   Pyrenochaeta terrestris  stalk rot and root rot  
   Pyrenophora teres  net blotch  
   Pyricularia setariae  blast of millet  
   Rosellinia necatrix  dematophora root rot  
   Sclerophthora macrospora  crazy top  
   Sclerophthora rayssiae var. zeae brown stripe downy mildew  
   Sclerospora graminicola  downy mildew of pearl millet  
   Sporisorium reilianum  head smut of maize  
   Stenocarpella macrospora  dry rot of maize  
 Virus   
   High plains virus  high plains  
   Wheat streak mosaic virus  wheat streak mosaic  
 Weed   
   Agropyron repens  couch grass  
   Alopecurus myosuroides  black -grass  
   Amaranthus albus  tumble pigweed  
   Amaranthus blitoides  spreading amaranth  
   Amaranthus retroflexus  redroot pigweed  
   Ambrosia trifida  giant ragweed  
   Asphodelus tenuifolius  onionweed  
   Avena fatua  wild oat  
   Axonopus fissifolius  common carpetgrass  
   Chenopodium album  fat hen  
   Cirsium arvense  creeping thistle  
   Cirsium vulgare  spear thistle  
   Convolvulus arvensis  field bindweed  
   Digitaria velutina  velvet fingergrass  
   Eragrostis cilianensis  stink grass  
   Galinsoga quadriradiata  shaggy soldier  
   Heliotropium europaeum  common heliotrope  
   Hibiscus trionum  Venice mallow  
   Orobanche  spp. broomrape  
   Pennisetum clandestinum  Kikuyu grass  
   Pennisetum macrourum  African feather grass  
   Parthenium hysterophorus  parthenium weed   
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Scientific name  Common name  
   Polygonum aviculare  prostrate knotweed  
   Polygonum convolvulus  black bindweed  
   Polygonum persicaria  redshank  
   Raphanus raphanistrum  wild radish  
   Senecio vulgaris  grinning (or grundie) -swallow  
   Setaria faberi  giant foxtail  
   Solanum carolinense  horsenettle  
   Solanum elaeagnifolium  silverleaf nightshade  
   Solanum viarum  tropical soda apple  
   Spergula arvensis  corn spurry  
   Striga angustifolia  witchweed  
   Striga aspera  witchweed  
   Striga densiflora  witchweed  
   Striga hermonthica  witchweed  
   Thlaspi arvense  field pennycress  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
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Annex  2 
 
 
 Additional  Conditions for Import  Maize  Seeds  from the  Union of  Myanmar  
 
Attached  to the  Notification of  Department  of Agriculture  
Re: Conditions for  Import  of Maize  Seeds  B.E. …. (….) 
 
---------------------------------------------------------  
 
1. Import  of maize  seeds  from  the Union  of Myanmar  must  comply  with the Notification  of 
Department  of Agriculture  Re: Conditions  for Import  of Maize  Seed  B.E. .... (....).  
 
2. Import  of maize  seeds  from  the Union  of Myanmar  must  comply  the following  additional  
conditions.  
 
(1) Maize  seeds  must  be subjected  to fumigation  before  export  with methyl   bromide  
or phosphine  at the following schedules.  
 
(a)     Methyl  bromide  
 
Temperature  Dosage rate 
(grams/m3) Exposure  period  
(hours)  
21 ° C or over 32 24 
16-20 ° C 40 24 
10-15 ° C 48 24 
 
(b)     Phosphine     
 
Active  
substance   
Temperature  Dosage rate 
(grams/m3) Exposure  
period  
(hours)  
Aluminium  phosphine  20 ° C or over 3 168 
Magnesium  phosphine  20 ° C or over 3 120 
Aluminium  phosphine  10 ° C or over 3 240 
Magnesium  phosphine  10 ° C or over 3 216 
 
(2)  The details  of fumigation  must be  inserted  in a phytosanitary  certificate.  
 
(3) For import  inspection  at the point  of entry  in the Kingdom  of Thailand,  if  
 live insects  are found,  the consignments  must  be must  be re-exported  or  
 destroyed  at importer’s  expense.