Table 2. Population density of N. lugens before & after the typhoon Khanun in 2005.
| Province | County | Paddy type* | The number of N. lugens per 100 hills | Increase or not | ||||
| Before Khanun | After Khanun | |||||||
| Aug. 30 | Sept. 5 | Sept. 10 | Sept. 15 | Sept. 20 | ||||
| Zhejiang | Xiaoshan | S | 235 | 1055 | 1985 | 16420 | 22975 | ↑ |
| Haining | S | 314 | 163 | - | 1603 | 1986 | ↑ | |
| AS(M) | 16(13) | 34(12) | - | 102(19) | 130(66) | ↑ | ||
| Dongyang | S | 174 | 811 | 2004 | 1168 | 578 | ↓ | |
| AS(M)§ | 257(252) | 32(22) | 20(16) | 1300(1260) | 488(420) | ↑ | ||
| Jiangsu | Yixing | S | 650 | 10660 | 13500 | 7440 | - | ↓ |
| AS(M) | - | 510(70) | 75(70) | 210(190) | - | ↑ | ||
| Tongzhou | S | 2522 | 1284 | 1730 | 5000 | 2445 | ↑ | |
| Gaochun | S | 1740 | 2660 | 3900 | 7080 | 18260 | ↑ | |
| Jingjiang | S | 507 | 475 | 10930 | 12713 | 21888 | ↑ | |
| Shanghai | Fengxian | S | 622 | 9439 | 11372 | 6431 | 9993 | ↓ |
| Zhejiang | Tiantai | F | - | 2856 | 3877 | 4644 | - | ↑ |
| AF(M) | - | 499(441) | 286(209) | 364(291) | - | ↑ | ||
| Zhuji | F | 1710 | 1333 | 5902 | 12422 | 12372 | ↑ | |
| AF(M) | 446(223) | 602(429) | 812(654) | 857(712) | 1159(1063) | ↑ | ||
| Xiaoshan | F | 25 | 23 | 100 | 390 | 367 | ↑ | |
| AF(M) | 23(23) | 17(17) | 22(22) | 57(57) | 67(63) | ↑ | ||
| Dongyang | F | 670 | 2250 | 3700 | 2210 | 1130 | ↓ | |
| Jiangsu | Yixing | F | 28.9 | 1232 | 1918 | 7130 | - | ↑ |
| Tongzhou | F | 376 | 517 | 858 | 894 | 2527 | ↑ | |
| Gaochun | F§ | 1211 | 2315 | 1410 | 997 | 678 | ↓ | |
| Jingjiang | F§ | 116 | - | 473 | 1511 | 4651 | ↑ | |
| Shanghai | Fengxian | F | 467 | 2766 | 5030 | 3606 | 3575 | ↓ |
*
S-Systematic investigation paddies which are moderately fertile with routine cultural practices and no pesticide use to control pests during the rice growing season; F-Famers' paddies; AS-Adults in systematic investigation paddies; AF-Adults in farmer's paddies; M-Macropterous adult.
§
The number of rice planthoppers, including N. lugens and Sogatella furcifera (Horváth), however, N. lugens account for more 80%.