Sitophilus oryzae
In 3 days ~10% in a week ~20%
The rice weevil (Sitophilus oryzae) is a stored product pest which attacks seeds of several crops, including wheat, rice, and maize. The adults are usually between 3–4.6 millimetres (0.12–0.18 in) long, with a long snout. The body color appears to be brown/black, but on close examination, four orange/red spots are arranged in a cross on the wing covers. It is easily confused with the similar looking maize weevil. The maize weevil is typically somewhat larger than the rice weevil, but rice weevils as large as the largest maize weevils and maize weevils nearly as small as the smallest rice weevils have been found. Some external features can be used to differentiate the vast majority of adults, but the only reliable features are on the genitalia (see table below). Both species can hybridize. The genitalic structure of hybrids is unknown.
The larvae are humpbacked and legless with a white to creamy white color. The head is small and tan. Adult rice weevils are able to fly, and can live for up to two years. Females lay 2–6 eggs per day and up to 300 over their lifetime. The female uses strong mandibles to chew a hole into a grain kernel after which she deposits... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zhuhai [Macau] | 🇨🇳 China | |
| 2 | Hong Kong | 🇨🇳 China | |
| 3 | Singapore | 🇸🇬 Singapore |
Rare
Under 5% of wildlife watchers report a Rice Weevil sighting in Singapore on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 891st most-seen of the 1045 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Rice Weevil in Singapore on a given day, so our monthly data shows no clear season.
3rd of 3
Of the 3 cities where we can rate Rice Weevil sightings, Singapore ranks 3rd at under 5%. The best odds are in Zhuhai [Macau] (China, about 10%) and Hong Kong (China, under 5%).
GBIF citizen-science records
It is estimated from how often the Rice Weevil is recorded against all the insects logged in Singapore (6 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.
