Reproduction of a Florida Population of<i>Tylenchulus semipenetrans</i>on Resistant Citrus Rootstocks

Abstract

Tylenchulus semipenetrans was detected at moderately high population density on seedlings of the hybrid rootstock Swingle citrumelo growing in a Florida citrus nursery. This rootstock is considered resistant to populations of T. semipenetrans in Florida. Seedlings of the nematode-resistant rootstocks Poncirus trifoliata (PT) and Swingle citrumelo (SC), and the susceptible rootstock rough lemon (RL) were planted in the nursery and in an orchard of mature citrus trees growing on RL rootstock infected by T. semipenetrans. After 5 mo, the numbers of adult females per gram of root in the nursery were smaller on PT than on RL, but densities of females on SC and RL were not different