Toxicities of Different Nematicides to Bursaphelenchus Xylophilus and Their Safety Evaluations
|School||Nanjing Forestry University|
|Keywords||Nematicides Trunk Injection Branches total volume model Application rate Safety Evaluation|
From pine wilt disease prevention and treatment of pharmaceutical the indoor screening, trunk injection test and nematicides Dendrolimus safety evaluation study , the following conclusions : ( 1 ) 19 single dose of nematicidal activity significantly different , 17 Pharmacy virulence , No. 33 , No. 25 , followed by No. 1 and No. 12 . Mixtures showed significant synergistic effect , the most significant ( No. 37 , No. 25 ) and No. 1 ( No. 17, No. 25 ) combination . (2) the the masson pine standing tree limb Volume y its diameter at breast height D fitting quadratic polynomial estimation model works best , power function followed by a linear function of the worst . (3 ) to the pine branches optimal estimate of the total timber volume model for the calculation of the theoretical basis of the plant trunk injection application rate , combined with Lin actual operating conditions at home and abroad experience application rate , integrated forest actual application rate : When the diameter at breast height for lt ; 10cm 10 ~ 15cm 15 ~ 20cm 20 ~ 25cm 25 to 30cm 30 to 40cm when the injection volume was 10ml , 40ml , 70ml , 110ml , 190 ml and 310ml . ( 4 ) The tests showed that the forest , No. 17 , No. 25 ( No. 1, No. 17, No. 39 ) a combination of these three pharmaceutical faster absorption . After injection of water extract of masson pine sprig of pine wood nematode virulence to evaluate the test pharmaceutical trunk nematicidal activity after injection , the results showed that the tested pesticides kill line effect is remarkable . (5) 6 Test agents trunk after injection can cause physiological changes in needles , mainly inhibitory effect on soluble sugar content ; proline content in the short term after injection can cause a sharp increase, but with the treatment time , and gradually returned to control levels ; chlorophyll and malondialdehyde content Pharmacy varieties .