Common names: erythrina gall wasp, erythrina gall wasp (EGW)
Taxonomic name: Quadrastichus erythrinae Kim
Life Cycle Stages:
Lifecycle stages Studies conducted by the Hawaii Department of Agriculture (HDOA) on Erythrina gall wasp (Quadrastichus erythrinae) indicate a life cycle (egg to adult) of about 20 days. A one-day old female wasp contains about 60 mature eggs in its ovaries. The adult female wasp exhibited a preference for depositing eggs in very young terminal leaves and stems, but not mature leaves. Adult wasps not given any food survived less than 3 days (males – 2.5 days, females – 2.9 days) while those provided with honey lived longer (males – 10.3 days, females – 6.1 days). The sex ratio of emerging wasps in lab-infested plants was 7 males to 1 female (Heu et al. 2006).
Common Names: Bruchid Beetle, Bean Weevil
Taxonomic Name: Bruchinae Specularis Impressi Thorax
Life Cycle Stages:
This is general weevil information and not specific to this genus.
The female bean weevil lays its small white eggs on bean pods in the field or on beans in storage. These eggs are easily visible on the outside of the beans and numerous eggs can be found on a single bean. Each female lays up to 6o eggs and the larvae emerge in about 5 to 20 days. The tiny, grub-like larvae bore their way into the bean and eat out a cavity. Several larvae feed on each bean and end up consuming a considerable portion of its insides. Following their last molt after 11 to 42 days of feeding, the larvae pupate near the surface of the bean and then emerge from the bean in 5 to 18 days, leaving numerous holes in the hole. The entire life cycle can take as little as 21 days or as long as 80 days depending on environmental conditions. Bean weevils are strong fliers and the first indication of infested stored beans is often the presence of flying weevils. The larvae of the bean weevil do all of the damage as the adults do not feed. Bean weevils feign death (play dead) when disturbed and may take up to five minutes to resume movement.