Abstract
A trial was sown on land infested with the pathogen causing Fusarium wilt to examine the effect of the disease in wilt-resistant and wilt-susceptible cottons with respect to the number of plants which developed symptoms, with wilt symptoms at harvest and amount of infected seed produced. Among wilt-susceptible cottons, more plants developed wilt and a larger number became infected late in the growing season, giving rise to a greater proportion showing wilt at maturity. Most of the seed infected with the pathogen came from plants showing wilt symptoms at harvesting and, so, susceptible cottons produced more infected seed than resistant ones. There was some evidence that where wilt-resistant plants became infected late in the season, and survived to produce mature bolls, they were less likely to contain infected seed than similar wilt-susceptible plants.
