Hypera postica
In 3 days ~10% in a week ~20%
Hypera postica, commonly known as the alfalfa weevil, is a species of weevil; it can be found in alfalfa fields throughout Europe. Considered a destructive threat to alfalfa production in North America, several accidental introductions have been successfully countered though the use of a variety of biological control species.
The alfalfa weevil grows to a length of about 4 to 5.5 mm (0.16 to 0.22 in). The rostrum or beak is short and broad. The frons is half as wide as the rostrum while the pronotum is broadest in the centre. The general colour of the insect is brown, with a dark mid-dorsal stripe. The larva has a distinctive black head and no legs; it is yellowish-green, with a white dorsal stripe and faint white lateral stripes. It is about 1 cm (0.4 in) long just before pupation. It pupates in a white, pea-sized cocoon made of loosely-woven silk. It resembles the clover leaf weevil (Hypera punctata), but that species is nearly twice as large, the larvae have tan heads and they seldom cause much damage to alfalfa crops.
In Illinois, some eggs are laid in the late fall or the winter, when weather conditions permit. Adults also overwinter and become... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mesa | 🇺🇸 United States | |
| 2 | Phoenix | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Austin | 🇺🇸 United States | |
| 5 | Tokyo | 🇯🇵 Japan | |
| 6 | Paris | 🇫🇷 France | |
| 7 | Sacramento | 🇺🇸 United States | |
| 8 | Los Angeles | 🇺🇸 United States | |
| 9 | San Francisco | 🇺🇸 United States | |
| 10 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report an Alfalfa Weevil sighting in San Antonio on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 581st most-seen of the 697 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 an Alfalfa Weevil in San Antonio on a given day, so our monthly data shows no clear season.
12th of 14
Of the 14 cities where we can rate Alfalfa Weevil sightings, San Antonio ranks 12th at under 5%. The best odds are in Mesa (United States, about 10%), Phoenix (United States, under 5%) and Dallas (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Alfalfa Weevil is recorded against all the insects logged in San Antonio (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.
