Palms, especially highly susceptible Canary Islands date palms, in California was officially confirmed on by USDA and seven additional detections were made over July – August 2011.
These initial detections were in San Ysidro in San Diego County, about 2.5 miles from the USA – Mexico border.
The fossil site, which has been the focus of a Penn State, Museo Palentologico Egidio Feruglio, Trelew, Argentina, and Cornell University project for more than a decade, was part of terminal Gondwana, the ancient supercontinent comprised of the adjacent landmasses of South America, Antarctica and Australia during a warm period of Earth history, just before their final separation.
"These astonishing, extremely rare specimens of physalis fruits are the only two fossils known of the entire nightshade family that preserve enough information to be assigned to a genus within the family," said Peter Wilf, professor of geosciences, Penn State.
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Physalis sits near the tips of the nightshade family's evolutionary tree, meaning that the nightshades as a whole, contrary to what was thought, are far older than 52 million years." Typically, researchers look for fossilized fruits or flowers as their first choice in identifying ancient plants.
— Delicate fossil remains of tomatillos found in Patagonia, Argentina, show that this branch of the economically important family that also includes potatoes, peppers, tobacco, petunias and tomatoes existed 52 million years ago, long before the dates previously ascribed to these species, according to an international team of scientists.
Tomatillos, ground cherries and husk tomatoes — members of the physalis genus — are unusual because they have papery, lantern-like husks, known to botanists as inflated calyces that grow after fertilization to extend around their fleshy, often edible berries.
The distribution of traps was as follows: (1) Alameda County – 20 traps; (2) Imperial County – 150 traps; (3) Los Angeles County – 73 traps; (4) Orange County – 200 traps; (5) Riverside County – 210 traps; (6) San Bernardino County – 25 traps; (7) San Diego County – 200 traps; (8) Santa Barbara County – 20 traps; (9) Santa Clara County – 30 traps; (10) Santa Cruz County – 10 traps; (11) Sonoma County – 10 traps; (12) Ventura County – 50 traps.
A total of 111 were captured in California; 109 in San Diego County (sex ratio was 57% female) over to 10 October 2013, and in Imperial County 2 weevils were trapped, 1 male on 4 August 2011 and 1 female on 5 September 2011.