拟粗壮螺旋线虫对棉花的致病力及其与棉枯萎病的复合症

 温室测定结果:拟粗壮螺旋线虫(Helicotylenchus pseudorobusius)接种量在每100cm³土壤100~1000条的条件下,接种30天后棉苗生长量比无线虫对照苗显著降低(P<0.05)。抗枯萎品种86-1在单接枯萎菌无线虫处理中不发生枯萎病,在枯萎菌(Fusarium oxysporum f. sp. vasinfectum)接种量为每克土7.5×10⁵孢子和线虫(每100cm³±500~1000条)组合处理中发病,棉苗枯萎病情指数与线虫接种量之间呈正相关(γ=0.97)。田间试验结果表明:防治线虫和枯萎病复合症用薰蒸剂棉隆每m²8~14g处理土壤比用非薰蒸性杀线虫剂克百威(呋哺丹),丙线磷(益收宝)和克线磷的效果更好。

PATHOGENICITY OF SPIRAL NEMATODE HELICOTYLENCHUS PSEUDOROBUSTUS AND THE FUSARIUM WILT DISEASE COMPLEX ON COTTON SEEDLINGS

The growth of cotton seedlings were reduced significantly (P<0.05) in pots inoculated with spiral nematode H. pseudorobuslus 100-1000 per 100cm³ soil compared with the non-nematode pots 30 days after sowing in greenhouse. Symptoms of fusarium wilt of cotton seedling of 86-1 (fusarium resistant) only occurred in treatments inoculated with both fungus (Fusarium oxysporum f. sp. vasinfectum) propagules 7.5×10⁵ per gram soil and nematodes (H. pseudorobustus) 500-1000 per 100 cm³ soil, but never occurred in the treatment with fungus alone. The fusarium wilt index of seedlings were correlated with the initial nematode population levels positively (r=0.97). Field experiment demonstrated that the application of fumigent da-zomet 8~14 grams per M² soil was more effective than that of non -volatile nematicides carbofuran, fenamiphos and ethoprop for control of nematode fusarium wilt disease complex.