School Entomology An Elementary Textbook of Entomology for Secondary Schools An
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The winged females are about the same length, the antennae are a third longer than the body, which is of the same general coloration except that the lobes of the thorax are brownish or blackish and the abdomen is marked with four or five transverse blackish spots in front of the nectaries.
The German Grain-aphis* is commonly associ- ated with this spe- cies and has very similar habits. It may be distin- guished by its lack- ing the blackish markings on the abdominal seg- ments.
These aphides ap...pear on the young wheat in the spring and multiply rapidly on the leaves until the grain commences to head, when they crowd among the ripening kernels. As the small grains ripen the aphides migrate to various grasses and are not in evidence during summer, but later migrate to volunteer oats and wheat, upon which they breed until fall wheat is avail- able.
* Macrosiphum cerealis Kalt.
FIG. 172. The German grain-aphis (Macro- siphum cerealis Kalt). (After Riley, U. S. Dept. Agr. ) a, winged migrant; b, nymph of same; c, wing- less parthenogenetic female; d, same showing exit hole of parasite enlarged.
What to read after School Entomology An Elementary Textbook of Entomology for Secondary Schools An?
You can find similar books in the "Read Also" column, or choose other free books by Ezra Dwight Sanderson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The winged females are about the same length, the antennae are a third longer than the body, which is of the same general coloration except that the lobes of the thorax are brownish or blackish and the abdomen is marked with four or five transverse blackish spots in front of the nectaries.
The German Grain-aphis* is commonly associ- ated with this spe- cies and has very similar habits. It may be distin- guished by its lack- ing the blackish markings on the abdominal seg- ments.
These aphides ap...pear on the young wheat in the spring and multiply rapidly on the leaves until the grain commences to head, when they crowd among the ripening kernels. As the small grains ripen the aphides migrate to various grasses and are not in evidence during summer, but later migrate to volunteer oats and wheat, upon which they breed until fall wheat is avail- able.
* Macrosiphum cerealis Kalt.
FIG. 172. The German grain-aphis (Macro- siphum cerealis Kalt). (After Riley, U. S. Dept. Agr. ) a, winged migrant; b, nymph of same; c, wing- less parthenogenetic female; d, same showing exit hole of parasite enlarged.
What to read after School Entomology An Elementary Textbook of Entomology for Secondary Schools An?
You can find similar books in the "Read Also" column, or choose other free books by Ezra Dwight Sanderson to read onlineMoreLess
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