Stem-borer incidence on upland and irrigated rice varieties is compared under natural or artificial infestation, and with simulated damage by sectioning tillers. In the early stages, Diopsids lay more eggs on irrigated varieties, but these are less suitable for the development of Diopsids larvae than upland varieties, whose stems are thicker.

Some varieties of Oryzae glaberrima show a high level of resistance to stem-borers and Hispids. Little difference is noticed for antibiosis of the Oryzae sativa studied, and losses depend on the tolerance of varieties. Irrigated varieties have a better tolerance because of their high tillering, preventing the attack, and of their ability to compensate for early losses by producing new tillers. This compensation does not exist for upland varieties. Their tolerance depends on tillering rate, the ability of infested stems to produce fertile panicles, and the difference in productivity between primary and secondary tillers, the former being more frequently infested. For the same population of stem-borers, losses observed on upland rice are three times lower on tolerant varieties than non-tolerant ones.