193 



Ferdinandsen (C.) & RosTRUP (S.). Oversigt over Sygdomme 

 hos Landbrugets og Havebrugets Kulturplanter i 1918. [Report 

 on Insect Pests and Fnngoiis Diseases of the Field and Orchard 

 in 1918]. — Tidskrijt Joy Flantcavl, Copenhagen, xxvi, 1919, 

 pp. 683-733. 



Among the cereal pests Oscinella frit did, as usual, great damage to 

 oats, especially because the spring corn was sown rather late on 

 account of cold and dry weather ; this also caused a great attack of 

 Chlorops taeniopus on barley. Attacks of Mayetiola {Cecidomyia) 

 destructor. Zabrus gihbus on rye, Jassiis scxnotatus on oats and spring 

 rye, Phyllotreta vittula on barley and oats, Tortrix paleana on oats, 

 Contarinia {Cecidomyia) tritici on wheat, and Hadena secalis and 

 H. basilinea on rye and wheat, were also recorded, but were of less 

 importance. 



The Aphids, Macrosiphum granarimn [Siphonophora cerealis) and 

 Siphonaphispadi { Aphis avenae),-pQ.xi\cn\diAythe\2iiiex, did considexdihle. 

 damage to oats and barley ; rye and wheat were also attacked by them. 

 The infestation appeared in June and July as a continuation of the 

 frit-fly attack, and owing to the dry weather the crops suffered severely. 

 Thrips—Limothrips denticornis on rye and barley and Haplothrips 

 {Anthothrips) aculeatiis on barley — were numerous, but did not do much 

 damage. The mite, Tarsonemus spirifex, was numerous on oats. 



Calandra gr anuria and Anobium paniceum did some damage in 

 stored grain. 



Sitona lineata did some damage to peas, on which an Aphid, a 

 thrips Kakothrips pisivora {Physopus robustus), larvae of Cydia 

 {Grapholitha) and Cecidomyiid larvae were also observed. 



Pests of cabbages, rape, turnips and beets included : — Silpha opaca, 

 Cassida nebidosa, and especially Pegomyia hyoscyami and Aphis 

 rumicis (/)a^«ygrw) attacking beets. Phorbia (Chortophila) brassicae, 

 Meligethes aeneus and flea-beetles did very serious damage to cabbages 

 and rape, while Ceuthorrhynchus quadridens, C. assimilis, C. sulcicollis. 

 Eitrydctna oleracea, Pieris brassicae, P. rapae, Barathra {Mamestra) 

 brassicae and Perrisia {Cecidomyia) brassicae were minor pests of these 

 crops. 



Carrots were attacked by Trioza viridula, Siphocoryne capreae, 

 Biston zonarius, which in one locality occurred in immense numbers, 

 and especially Psila rosae. Celery was frequently infested with the 

 mines of Acidia cognata, and potatoes in some places were severely 

 attacked by Calocoris hipunctatus ; Hydroecia micans was also recorded 

 from potatoes. 



On lucerne and clover attacks were recorded of Sitona lineata, 

 Hypera {Phytonomus) nigrirostris, H. (P.) variabilis and Apioii 

 apr leans. 



Larvae of Hadena strigilis did some damage to cock's-foot grass 

 cultivated for seed. Cleigastra flavipes also attacked grasses. 



Apple and pear pests included : — Cheimatobia brumata and C. 

 boreata, Olethreutes variegana, Eucosma ocellana, Notolophus {Orgyia) 

 antiquus and especially Anthonomus pomornm and Malacosoma 

 {Gastro pacha) neustria. 



Larvae of Cydia pomonella {Carpocapsa pomonana) were frequently 

 met with in apples, but very rarely in pears ; those of Hyponomeuta 

 were common on Crataegus but scarce on apple and pear trees. 

 Phyllobius oblongiis, Lyonetia clerkella, Thomasia {Diplosis) oculiperda, 



2290 P 



