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There are eight different species that cause yield loss of sunflowers; however, Alternaria helianthi is the primary causal agent and most widespread. [5] The main hosts are sunflowers (Helianthus annuus); however, it has been proven that safflower (Carthamus tinctorius), noogoora burr (Xanthium pungens), cocklebur (Xanthium strumarium), and Bathurst burr (Xanthium spinosum) can serve as ...
P. helianthi produces these symptoms on sunflower: Yellow-orange spots on upper leaves surrounded by a chlorotic halo; Orange-brown spots on the underside of leaves; Rust spots that may appear dusty on leaves, stems, petioles, and back of the flower head [5]
These are some of the less obvious possible signs of cancer… 1. Fatigue. It’s normal to feel tired sometimes, and a good night’s sleep and some rest is usually all that’s needed to feel ...
Melanoma is the most rapidly increasing cancer. Dan Belkin, MD, a dermatologist and skin cancer surgeon, explains Dermatologist warns of three hidden spots where skin cancer often appears [Video]
Bacterial diseases; Apical chlorosis Pseudomonas syringae pv.tagetis: Bacterial leaf spot Pseudomonas syringae pv.aptata. P. cichorii Pseudomonas syringae pv.helianthi
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Actinic keratosis (AK), sometimes called solar keratosis or senile keratosis, [1] [2] is a pre-cancerous [3] area of thick, scaly, or crusty skin. [4] [5] Actinic keratosis is a disorder of epidermal keratinocytes that is induced by ultraviolet (UV) light exposure ().
Facial drooping (often combined with not sweating on one side of your face) can be a sign of lung cancer. "These symptoms can reflect a lesion or mass in the top part, or the apex, of the lung ...