We had replanted bean seeds in the kindergarten bed to test the difference between "eucalyptus affected" soil vs good soil. After sprouting several bean plants began to die. Looking closely at one of the dying plants this morning I noticed tiny pill bugs leaving the plant where a hole had been chewed in the plant stem at or below the soil level. New theory: it's possible that the old (rotting?) garden border may be a haven for undesirable insects that come out and attack the plants at night. Beans planted under the trellis have had the same problem of dying suddenly after a seemingly good start; these beans are planted adjacent to old railroad ties like those in the kindergarten bed.