The flight responses of female C. kariyai were observed with respect to two groups of maize plants. Each respective group consisting of three potted plants was positioned 20 cm apart in a cage (25635630 cm; three windows covered by nylon gauze and one door for introducing plants and wasps). An individual female wasp was released halfway between the two groups. Pots in the cage were replaced every 10 trials. The first landing by each wasp on a plant in either of the two pots was recorded as its choice. The wasp—once it landed on a plant—was immediately removed from the cage with an insect aspirator. Three replicates were performed, each with 10 wasps per test. Wasps that did not land on either of the two pots within 20 min (‘‘no choice’’ subjects) were excluded from the statistical analysis (binomial test). Each bioassay was performed in a climate-controlled room at 25uC.