Pecan IPM Toolbox
Insect Monitoring and Control
Temperature Prediction Method for Adult PNC Activity
Table: Stages at which 1st generation PNC are likely to occur relative to day degree accumulations.1
Overwintering Generation
1st Summer Generation
Adult Female
Percentile
Pupationa/
Emergenceb/
Ovipositionc/
Hatchc/
Nut Entryc/
1st observed
1350.3
1440.42
1680.9
1733.3
1st significant
---
---
---
---
1831.1
10
955.9
1521.1
1822.5
1877.2
1908.8
25
1057.0
1631.0
1915.5
1008.7
2100.2
50
1183.0
1740.3
1932.5
2062.1
2136.1
75
1311.5
1865.1
1978.0
2274.0
2368.3
90
1413.0
1940.6
2146.0
2365.4
2610.3
Last observed
1733.5
2140.9
2420.8
2450.7
2610.3
| Overwintering Generation | 1st Summer Generation | ||||
| Adult Female | |||||
| Percentile | Pupationa/ | Emergenceb/ | Ovipositionc/ | Hatchc/ | Nut Entryc/ |
| 1st observed | 1350.3 | 1440.42 | 1680.9 | 1733.3 | |
| 1st significant | --- | --- | --- | --- | 1831.1 |
| 10 | 955.9 | 1521.1 | 1822.5 | 1877.2 | 1908.8 |
| 25 | 1057.0 | 1631.0 | 1915.5 | 1008.7 | 2100.2 |
| 50 | 1183.0 | 1740.3 | 1932.5 | 2062.1 | 2136.1 |
| 75 | 1311.5 | 1865.1 | 1978.0 | 2274.0 | 2368.3 |
| 90 | 1413.0 | 1940.6 | 2146.0 | 2365.4 | 2610.3 |
| Last observed | 1733.5 | 2140.9 | 2420.8 | 2450.7 | 2610.3 |
1 Developed by the Texas Agricultural Experiment Station, Department of Entomology, Texas A&M University
a/ Verify by banding.
b/ Verify by black light traps.
c/ Verify by inspecting 20 nut clusters on each of 20 trees every day.
Next: Steps for Using
Day Degrees
as a Prediction of PNC
Adult Emergence