Investigations Of Plant Nematodes And Control Of Root-knot Nematodes On Mulberry In Guangxi

Plant nematodes were surveyed in some mulberry growing areas in Yizhou, Xiangzhou and Hengxian of Guangxi in order to study their species and dominant species. Four species and nine genera of plant parasitic nematodes were identified:Meloidogyne incognita, Helicotylenchus exallus, Criconemella informis, Paratylenchus sp., Psilenchus hilarulus, Filenchus sp., Tylenchorhynchus sp., Aphelenchus sp., Gracilacus sp., among them, Criconemella informis, Paratylenchus sp., Psilenchus, Filenchus sp., Tylenchorhynchus sp., Aphelenchus sp., Gracilacus sp. were reported in Guangxi for the first time. Meloidogyne incognita was the dominant species,(mean of larval population was123heads of2nd larva per100ml soil), Helicotylenchus exallus was the secord dominated one (39.1heads per100ml soil), the others were all lower than10heads per100ml soil.The result showed that2500heads of Meloidogyne incognita2nd larva for every mulberry is an appropriate inoculation. Guisangyou62、Sangteyou1were found to be resistant to the Meloidogyne incognita, Sha2×lun109、Sangteyou2and Guisangyou12were susceptible.After infected by Meloidogyne incognita, the plant height、leaf number and leaf fresh weight of the susceptible varieties mulberry were more affected, leaf length、leaf width were less affected. Agronomic traits of the resistant varieties mulberry were all affected less than the susceptible varieties mulberry. Every agronomic trait of mulberry in pot experiment was affected more than in yield experiment.The control effect of Cadusafos、Fosthiazate、Phosphorus were exceed70%in both pot experiment and yield experiment, the others were above50%.The residual poison of nematicides from long to short:Chlorantrani、Fosthiazate、 Verticilliumchlamydosporium、Carbosulfan、Chlorpyrifos、Abamectin、Phosphorus、 Cadusafos、Emamecin benzoate; the rate of silkworm no-cocooned from high to low was: Fosthiazate、Verticilliumchlamydosporium、Carbosulfan、Chlorpyrifos、Phosphorus、 Cadusafos、Abamectin、Emamecin benzoate.We recommend0.5%Abamectin granules used as hole fertilization4kg/acre into root in neighboring mulberry leaf harvest time.5%Cadusafos granular and10%Ethoprophos granular used as hole fertilization3kg/acre,4kg/acre, separately, which should be used more than half a month ahead to pick mulberry leaves. After confirm non-toxic to silkworm fed by a few mulberry leaves, the large area will be used. However,200g/L chlorantraniliprole suspending agent,10%Fosthiazate granular,250million spores/g verticilliunm chlamydosporium microgranule,200g/L Carbosulfan missible oil and40%Dursban missible oil are not recommended.