Ricania speculum
In 3 days ~20% in a week ~30%
Ricania speculum, common name Black planthopper or Ricaniid Planthopper, is a species of planthoppers belonging to the family Ricaniidae. This species is considered a major agricultural pest for several crops in tropical and subtropical areas (apples, coffee plants, oil palms, Citrus species, etc.).
This species is widespread in China, India, Indonesia, Japan, Korea, Philippines and Vietnam. Recently, it has been accidentally introduced in northern Italy, possibly with ornamental plants or crops. This species can be found in the low-elevation mountains and prefers dark environments.
Ricania speculum can reach a length of about 8 millimetres (0.31 in), with a wingspan of about 15 millimetres (0.59 in). These planthoppers have dark brown wings with central wavy horizontal bands and irregular transparent patches of different sizes. The precostal area of the forewings shows dense transverse veinlets and the costal margin is distinctly convex near the base. In males the tip of the abdomen is pointed, while in females is rounded. The final instar nymphs are white with dark brown markings and waxy secretions on the abdomen.
These... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kaeng Krachan National Park | 🇹🇭 Thailand |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Davao City | 🇵🇭 Philippines | |
| 2 | Turin | 🇮🇹 Italy | |
| 3 | Milan | 🇮🇹 Italy | |
| 4 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka | |
| 5 | Kochi | 🇮🇳 India | |
| 6 | Beijing | 🇨🇳 China | |
| 7 | Seoul | 🇰🇷 South Korea | |
| 8 | Singapore | 🇸🇬 Singapore | |
| 9 | Jakarta | 🇮🇩 Indonesia | |
| 10 | Hangzhou | 🇨🇳 China |
With luck
About 10% of wildlife watchers report a Black Planthopper sighting in Hangzhou on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 145th most-seen of the 172 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Black Planthopper in Hangzhou on a given day, against under 5% in August to May, the lowest months. Those are among Hangzhou's wettest months, with about 200 mm of rain a month against 65 mm in December.
Between 4 and 7 pm
Across all the parks we cover, that three-hour window holds the most Black Planthopper sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
10th of 13
Of the 13 cities where we can rate Black Planthopper sightings, Hangzhou ranks 10th at about 10%. The best odds are in Davao City (Philippines, about 30%), Turin (Italy, about 10%) and Milan (Italy, about 10%).
Same family: Ricaniidae
The closest relatives of the Black Planthopper that you can see in Hangzhou (family Ricaniidae, Ricaniid Planthoppers) are Pochazia guttifera (about 10%) and Euricania facialis (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Planthopper is recorded against all the insects logged in Hangzhou (5 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
