Table 3.
Mean numbers (±SE) of Halyomorpha halys adults per plant and per sampling period, collected on host plants in the four study areas from mid-April to mid-June. Abundance of H. halys referred to each 10-day period is given as qualitative index as follows: - = absence; + = 0.1–1; ++ = 1.1–4; +++ ≥ 4.1 mean adults/plant (sampling unit). Shading indicates the fruiting period of plants. Areas in which plants were sampled are also given; bold areas indicate the presence of bugs on the plant in that area.
| Host Plants | April | May | June | Mean No. | Area of Presence | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Common Name | Family | Scientific Name | II | III | I | II | III | I | II | ||
| peach | Rosaceae | Prunus persica (L.) Batsch | - | ++ | - | +++ | ++ | 3.07 ± 2.06 | 1 | ||
| mulberry | Moraceae | Morus rubra L. | - | - | ++ | ++ | ++ | 1.63 ± 0.78 | 1, 2 | ||
| apple | Rosaceae | Malus domestica Borkh. | + | - | ++ | 1.33 ± 0.88 | 1, 2, 4 | ||||
| common ash | Oleaceae | Fraxinus excelsior L. | - | - | ++ | - | + | +++ | + | 1.24 ± 0.70 | 2, 4 |
| maple | Sapindaceae | Acer spp. | - | - | - | - | - | ++ | ++ | 0.63 ± 0.40 | 1, 2, 3, 4 |
| hybrid plane | Platanaceae | Platanus hispanica Mill. | ++ | - | - | - | - | 0.60 ± 0.60 | 4 | ||
| American pokeweed | Phytolaccaceae | Phytolacca americana L. | + | - | 0.50 ± 0.50 | 2 | |||||
| sorrel | Polygonaceae | Rumex spp. | + | - | 0.50 ± 0.50 | 3, 4 | |||||
| vetch | Fabaceae | Vicia spp. | + | - | 0.50 ± 0.50 | 4 | |||||
| hazelnut | Betulaceae | Corylus avellana L. | - | - | - | - | - | + | ++ | 0.40 ± 0.32 | 1, 2, 3, 4 |
| cherry | Rosaceae | Prunus avium (L.) L. | - | - | + | + | + | + | + | 0.34 ± 0.09 | 1, 2, 3, 4 |
| bay | Lauraceae | Laurus nobilis L. | - | - | + | 0.33 ± 0.33 | 1 | ||||
| black poplar | Salicaceae | Populus spp. | - | - | ++ | - | - | - | 0.33 ± 0.33 | 2, 3, 4 | |
| black walnut | Juglandaceae | Juglans nigra L. | + | - | - | 0.33 ± 0.33 | 2, 3 | ||||
| wild hop | Cannabaceae | Humulus lupulus L. | - | + | - | 0.33 ± 0.33 | 1, 2, 3 | ||||
| European spindletree | Celastraceae | Euonymus europaeus L. | - | + | + | + | - | + | 0.33 ± 0.12 | 2, 3 | |
| ivy | Araliaceae | Hedera helix L. | - | - | - | - | + | ++ | - | 0.30 ± 0.20 | 1, 3, 4 |
| walnut | Juglandaceae | Juglans regia L. | - | + | + | + | + | + | - | 0.29 ± 0.11 | 1, 2, 3, 4 |
| fig | Moraceae | Ficus carica L. | - | - | ++ | - | - | 0.27 ± 0.27 | 1 | ||
| false indigo-bush | Fabaceae | Amorpha fruticosa L. | - | - | + | - | - | 0.20 ± 0.20 | 3 | ||
| black locust | Fabaceae | Robinia pseudoacacia L. | - | - | + | + | + | - | + | 0.18 ± 0.08 | 1, 2, 3, 4 |
| common wheat | Poaceae | Triticum aestivum L. | - | + | - | - | - | + | 0.17 ± 0.11 | 2, 3 | |
| European elder | Adoxaceae | Sambucus nigra L. | - | + | + | - | - | - | + | 0.16 ± 0.10 | 1, 2, 3, 4 |
| bloody dogwood | Cornaceae | Cornus sanguinea L. | - | - | + | - | + | + | - | 0.14 ± 0.07 | 1, 2, 3, 4 |
| elm | Ulmaceae | Ulmus minor Mill. | - | - | - | - | + | + | 0.13 ± 0.09 | 1, 2, 3, 4 | |
| oak | Fagaceae | Quercus spp. | - | + | + | + | - | - | - | 0.11 ± 0.07 | 1, 2, 3, 4 |
| sand grape | Vitaceae | Vitis rupestris Scheele | - | - | - | + | - | 0.10 ± 0.10 | 1, 2, 3 | ||
| blackthorn | Rosaceae | Prunus spinosa L. | - | - | - | - | - | + | 0.08 ± 0.08 | 1, 2 | |
| willow | Salicaceae | Salix spp. | - | - | - | + | - | - | - | 0.07 ± 0.07 | 2, 3, 4 |