Ảnh hưởng của vi nhũ Chitosan-dầu neem đến sâu khoang hại rau (Spodoptera litura) trong phòng thí nghiệm

Neem  oil  has  been  used  widely  in  agriculture  due  to  its  insecticidial  effect  and  its  safety  for  hot-blooded animals.  However,  as  many  bioactive  substances,  the  slow  effect  time  and  the  high  sensitivity  of  neem  oil  can reduce its pesticide activity when exposed to adverse environment conditions (high temperatures, light, rain, etc.). 

In  this  study,  to  test    the  insecticidial  effectivity  and  the  other  activities    of  neem  oil  when  it  was  combined  with chitosan microemulsion The experiments were tested on 6-day-old cutworm larvae for the lethal effect, repelling activity,  and  antifeeding.  The  results  showed  that, 80%  and 100%  of  cutworm  larvae  were  killed  after  8  days  at 7.5 %,  and 100% Chitosan-neem oil. With the low concentration of the combinations,  4.5 and 7.5%,  repelling of  worm larvae and antifeeding activity occurred. These results indicated that combination of neem oil and chitosan microparticles obtained pesticide effectively and its insect-killing time was rolonged. 

Keywords: neem oil, cutworm larval, Spodoptera litura, Chitosan-neem microemulsio

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Neem  oil  has  been  used  widely  in  agriculture  due  to  its  insecticidial  effect  and  its  safety  for  hot-blooded animals.  However,  as  many  bioactive  substances,  the  slow  effect  time  and  the  high  sensitivity  of  neem  oil  can reduce its pesticide activity when exposed to adverse environment conditions (high temperatures, light, rain, etc.). 

In  this  study,  to  test    the  insecticidial  effectivity  and  the  other  activities    of  neem  oil  when  it  was  combined  with chitosan microemulsion The experiments were tested on 6-day-old cutworm larvae for the lethal effect, repelling activity,  and  antifeeding.  The  results  showed  that, 80%  and 100%  of  cutworm  larvae  were  killed  after  8  days  at 7.5 %,  and 100% Chitosan-neem oil. With the low concentration of the combinations,  4.5 and 7.5%,  repelling of  worm larvae and antifeeding activity occurred. These results indicated that combination of neem oil and chitosan microparticles obtained pesticide effectively and its insect-killing time was rolonged. 

Keywords: neem oil, cutworm larval, Spodoptera litura, Chitosan-neem microemulsio

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Chuyên mục: D. Luận văn D. Luận văn chuyên ngành Nông lâm nghiệp (Agriculture and Forestry)