Plasmo para hi-res stock photography and images

RF2GYAGX3–Falscher Mehltau

RF2GGRRFX–Downy Mildew

. A textbook of botany for colleges and universities ... Botany. THALLOPHYTES 67 of zoospores, a feature which distinguishes the genus from Peronospora, under which the grape mildew was placed formerly. In the life history of Plasmo- para, therefore, zoospores, characteristic of Oomycetes, have been eliminated. This disease is of American origin and was unknown in Europe until American grape stocks were introduced as a protection against the destructive phylloxera. Peronospora. — These forms are very common parasites on ordinary vegetables, as peiis, beans, spinach, etc., and differ from Plasm Stock Photo

RMRDYG2W–. A textbook of botany for colleges and universities ... Botany. THALLOPHYTES 67 of zoospores, a feature which distinguishes the genus from Peronospora, under which the grape mildew was placed formerly. In the life history of Plasmo- para, therefore, zoospores, characteristic of Oomycetes, have been eliminated. This disease is of American origin and was unknown in Europe until American grape stocks were introduced as a protection against the destructive phylloxera. Peronospora. — These forms are very common parasites on ordinary vegetables, as peiis, beans, spinach, etc., and differ from Plasm

RF2GYAGY2–Falscher Mehltau

RF2GGRRFR–Downy Mildew

. Nature and development of plants. Botany. Fig. 132. Fig. 133. Fig. 132. Asexual reproduction of the mildew: A, hyphae of Plasmo- para emerging from a stoma and bearing numerous sporangia. B, enlarged view of sporangium of Peronospora germinating on a dry leaf. In this case the sporangium behaves as a spore sending out a hypha that will penetrate the tissues of the leaf. C, sporangium of Phytophthora germinating in the water and forming zoospores. D, zoospore enlarged. E, zoospore has come to rest and is forming a tube that will penetrate the tissues of the leaf as in the case of 5. Fig. 133. Stock Photo

RMRDWG4D–. Nature and development of plants. Botany. Fig. 132. Fig. 133. Fig. 132. Asexual reproduction of the mildew: A, hyphae of Plasmo- para emerging from a stoma and bearing numerous sporangia. B, enlarged view of sporangium of Peronospora germinating on a dry leaf. In this case the sporangium behaves as a spore sending out a hypha that will penetrate the tissues of the leaf. C, sporangium of Phytophthora germinating in the water and forming zoospores. D, zoospore enlarged. E, zoospore has come to rest and is forming a tube that will penetrate the tissues of the leaf as in the case of 5. Fig. 133.

RF2GYAGWE–Falscher Mehltau

. Nature and development of plants. Botany. 222 REPRODUCTION OF THE DOWNY MILDEWS does not appear until the latter part Of July. K only becomes of serious importance in sultry weather, when a short period of rain will result in the formation of the sporangia and whole fields will be devastated in a few days. ly. A Fig. 132. Fig. 133. Fig. 132. Asexual reproduction of the mildew: A, hyphae of Plasmo- para emerging from a stoma and bearing numerous sporangia. B, enlarged view of sporangium of Peronospora germinating on a dry leaf. In this case the sporangium behaves as a spore sending out a hyph Stock Photo

RMRE1R52–. Nature and development of plants. Botany. 222 REPRODUCTION OF THE DOWNY MILDEWS does not appear until the latter part Of July. K only becomes of serious importance in sultry weather, when a short period of rain will result in the formation of the sporangia and whole fields will be devastated in a few days. ly. A Fig. 132. Fig. 133. Fig. 132. Asexual reproduction of the mildew: A, hyphae of Plasmo- para emerging from a stoma and bearing numerous sporangia. B, enlarged view of sporangium of Peronospora germinating on a dry leaf. In this case the sporangium behaves as a spore sending out a hyph