Figure 1
Study area: 1 – Czarnca site, 2 – Kurzelów site, 3 – ‘Strunobet’ concrete factory, 4 – forest areas, 5 – roads, 6 – railway line, 7 – the area of the Włoszczowa-Jędrzejów Protected Landscape Area (Own elaboration)
Figure 2
Black locust (Robinia pseudoacacia L.) leaf (photo. B. Matyśkiewicz).
Table 1
Analysis of collected material at study sites in 2014–2015
| Site | Number of leaves | Number of leaves with outgrowth | Number of pinnules on leaves | Number of leaflets with outgrowths | Number of outgrowths on leaflets | Average number of outgrowths per leaf | Average number of outgrowths per leaflet |
|---|---|---|---|---|---|---|---|
| Czarnca | 2,500 | 1,985 | 36,352 | 6,856 | 8,783 | 4.4 | 1.3 |
| (79.4%) | (18.9%) | ||||||
| Kurzelów | 2,500 | 1,254 | 39,139 | 1,789 | 2,838 | 2.3 | 1.6 |
| (50.2%) | (4.8%) | ||||||
| Total | 5,000 | 3,239 | 75,491 | 8,645 | 11,621 | 3.6 | 1.3 |
| (64.8%) | (11%) |
[i] Source: Own elaboration
Figure 3
Analysis of acacia robinia leaves and leaflets with outgrowths, on the Czarncy and Kurzelów sites, in successive years of the study
Source: own elaboration
Table 2
Frequency index of the occurrence of outgrowths (F) on black locust leaves at sites in Czarnca and Kurzelów in 2014–2015
| Site | Year | F |
|---|---|---|
| Czarnca | 2014 | 0.22 |
| 2015 | 0.18 | |
| 2014–2015 | 0.2 | |
| Kurzelów | 2014 | 0.04 |
| 2015 | 0.04 | |
| 2014–2015 | 0.03 |
[i] Source: Own elaboration
Table 3
Indicators of black locust leaves colonisation by the black locust gall midge at test sites in 2014 and 2015.
| Site | Year | Absolute colonisation index | Relative index colonisation index |
|---|---|---|---|
| Czarnca | 2014 | 0.29 | 1.33 |
| 2015 | 0.21 | 1.24 | |
| 2014–2015 | 0.24 | 1.28 | |
| Kurzelów | 2014 | 0.08 | 1.66 |
| 2015 | 0.07 | 1.54 | |
| 2014–2015 | 0.07 | 1.59 |
[i] Source: Own elaboration
Figure 4
Black locust leaf with an impairment (photo B. Matyśkiewicz)