Figure 7. An overview of the life cycle of the: European chafer, June beetle and the Japanese beetle.

European chafer:

3rd instar - Jan. to mid May
Pupa - mid May to mid June
Adult - mid June to mid Aug.
Egg - mid June to Aug.
1st instar - mid July to mid Sept.
2nd instar - Sept. to mid Oct.
3rd instar - Oct. to Dec.

June Beetle:

Year 1:

Dormant adult - Jan to mid May
Emerging adult - mid May to mid Aug.
Egg - July to mid Aug
1st instar - Aug to Oct
2nd instar - mid Sep to Dec

2nd Year:

2nd instar - Jan to mid May
3rd instar - mid May to Dec

3rd Year:

3rd instar - Jan to mid May
Pre-pupa -End of Apr to mid Jun
Pupa - June to mid July
Adult (in soil, dormant) - July to Dec

Japanese beetle:

3rd instar - Jan to July
Pupa - mid June to mid July
Adult - July to mid Sept
Egg - July to mid Aug
1st instar - mid Aug to mid Sept
2nd instar - Sept to mid Oct.
3rd instar - Oct. to Dec.