Archivos de diario de mayo 2024

05 de mayo de 2024

Misidentification of Trifolium observations in CA

The following charts show the number of observations for species within the genus Trifolium in California and the number of times the species has been misidentified in iNaturalist. The purpose of this analysis is to pinpoint species with high misidentification rates (to focus on correcting) and to provide a method of measuring improvements over time.

I split the species into two charts for clarity. The first chart lists the species with >1,000 observations (green). The second chart lists the species with between 500 and 999 observations (blue). Species with fewer than 500 observations were not charted. Misidentifications are in red. Misidentification data was obtained from the 'Taxa Info' page in iNaturalist under the 'Similar Species' tab. The data are further filtered to include only observations in California.

Following are other metrics for the Trifolium genus in CA as of the date of this posting:
Total Observations: 38,596
Total Misidentifications: 2,599
Unconfirmed IDs: 5,088
No Flowers/Fruits: 958
Errors: 67
Errors include: missing date, multiple species in photos, duplicate observations, etc.


Publicado el mayo 5, 2024 08:29 TARDE por truthseqr truthseqr | 1 comentario | Deja un comentario

27 de mayo de 2024

Pathogens and Pests that Affect Malvaceae Plants in CA

Here are some of the pathogens and pests that affect plants in the Malvaceae family in California:


  • Hollyhock Rust (Puccinia malvacearum). Plants can easily get P. malvacearum from metal fences. Orange-brown pustules on the underside of leaves are indicative of this disease.
  • Powdery mildew (dusty white powder covering leaves and stems)
  • Botrytis blight has a characteristic gray fungal growth
  • Leaf spots caused by pathogens such as Alternaria, Cercospora, Colletotrichum, or Septoria spp., create sharply defined necrotic lesions on mallow leaves.
  • Antrhacnose is a disease that causes dark, sunken lesions on the leaves and stems.
  • Verticillium is a soil-borne fungus that is difficult to get rid of. Wilting leaves are a symptom.


  • The mallow flea beetle prefers mallows and hollyhocks. This beetle is usually up to 5 mm (0.2 inches) long and can be identified by its yellow-red head and dark blue wing coverlets. Mostly, these pests are not dangerous to the plant.
  • The Mallow Leaf Miner (Calycomyza malvae) causes damage to the leaves.
  • Bactericera lavaterae (a psyllid that causes galls on Island Mallow)
  • Other pest problems include Japanese beetles, spider mites, snails and slugs.


Publicado el mayo 27, 2024 06:23 TARDE por truthseqr truthseqr | 0 comentarios | Deja un comentario

Bull Mallow (Malva nicaeensis) - Variation in Size within a County Park

On May 26, 2024, I noticed several Malva nicaeensis plants of very different sizes. The smallest one was no bigger than the palm of my hand (in breadth and height). The largest one was waist high (approx. 35 inches). Very interesting! Especially in light of the fact that Jepson eFlora states that M. nicaeensis only grows to 2-6 dm (23.6 in) tall.

Sample 1:
This plant was very tiny - no bigger than the palm of my hand (~3 inches in diameter; ~1.4 in tall). The flowers and fruits were also very tiny. This plant was growing in the hard-packed dirt on the trail under full sunlight.

Sample 2:
This plant was as tall as my hand (~6 in) and only a few inches wide. It was growing in the shade under sycamore and California bay trees.

Sample 3:
This plant was twice as wide as Sample 1, but the flowers and fruits were about the same size. It was also growing in hard-packed dirt in the middle of the trail in full sunlight.

Sample 4:
This one was knee high (~20 inches). It was growing in the shade under some oak trees. The tips of this plant had been nibbled on - perhaps by the nearby herd of cows, so it was probably once taller than the measured height.

Sample 5:
This one was lying prostrate on the ground, but when I raised the stem, it was waist high (~35 inches). There were three main stems and lots at the leaf axils along the stem. It was growing with milk thistles along the side of the trail in full sun.

Sample 6:
I also noticed some M. nicaeensis leaves infected with some sort of virus. This is a new observation for me.

Publicado el mayo 27, 2024 07:07 TARDE por truthseqr truthseqr | 4 observaciones | 2 comentarios | Deja un comentario