Table 2. General stylet penetration features. Relative figures (%) on main EPG results. Fractions of time probing and non-probing are taken from the first probe to the end of recording. Fractions (%) of all aphids (N=20), i.e. showing phloem activities, E1, sieve element salivation; E2 sieve element ingestion; sE2 sustained sieve element ingestion (>10 min). Treatments 2 and 5 are showing aphid-induced resistance, in treatments 3 and 4 the induced resistance appears to be absent, locally suppressed as we suggest. Treatments in accordance to Table 1.
| Pre-infested plants | ||||||
|---|---|---|---|---|---|---|
| Systemic leaves | Local leaves | |||||
| Control | with aphids | without aphids | Volatile exposed | |||
| treatment | 1 | 2 | 3 | 4 | 5 | |
| A | Average % time: | |||||
| non-probing | 19 | 40** | 27 | 27 | 35** | |
| probing | 81 | 60** | 73 | 73 | 65** | |
| B | % aphids with: | |||||
| E1 | 100 | 35** | 100 | 90 | 70 | |
| E2 | 100 | 30** | 90 | 90 | 60** | |
| sE2 | 90 | 15** | 85 | 75 | 30** | |