Management of Root-knot Nematode (<i>Meloidogyne incognita</i>) on <i>Pittosporum tobira</i> Under Greenhouse, Field, and On-farm Conditions in Florida

Abstract

Root-knot nematodes are important pests of cut foliage crops in Florida. Currently, effective nematicides for control of these nematodes on cut foliage crops are lacking. Hence, research was conducted at the University of Florida to identify pesticides or biopesticides that could be used to manage these nematodes. The research comprised on-farm, field, and greenhouse trials. Nematicide treatments evaluated include commercial formulations of spirotetramat, furfural, and <i>Purpureocillium lilacinum</i> (=<i>Paecilomyces lilacinus</i>) strain 251. Treatment applications were made during the spring and fall seasons according to manufacturer's specifications. Efficacy was evaluated based on J2/100 cm³ of soil, J2/g of root, and crop yield (kg/plot). Unlike spirotetramat, which did not demonstrate any measurable effects on <i>Meloidogyne incognita</i> J2 in the soil, furfural and <i>P. lilacinum</i> were marginally effective in reducing the population density of <i>M. incognita</i> on <i>Pittosporum tobira</i>. However, nematode reduction did not affect yield significantly. Although furfural and <i>P. lilacinum</i> have some potential for management of <i>M. incognita</i> on cut foliage crops, their use as a lone management option would likely not provide the needed level of control. Early treatment application following infestation provided greater J2 suppression compared to late application, suggesting the need for growers to avoid infested fields.