698 



and on soil rich in humus. Phyllopertha horlicola swarmed as usual in 

 June in several places and attacked various trees. The larva of Dascillus 

 cervinus attacked oats and Heterodera schachtii var. avenae during the 

 dry summer caused great damage, especially to oats or crops mixed 

 with oats, when the intervals in the rotation were too short. The 

 use of nitrogenous fertilisers has often been observed to check these 

 attacks. Hylemyia coarctata, especially in Fyn, caused some damage, 

 but not so much as in 1913. In Fyn a comparatively serious attack 

 of Phyllotreta {HaUicci) vittula on winter barley was observed in May, 

 this being the first time that this pest has been recorded from Denmark. 

 Oscinella {Oscinis) frit has been exceedingly common and the attack 

 has been quite as serious as in 1905. The climatic conditions have 

 also been the same in these two years, viz : a mild winter, a warm 

 March, cold weather in April and May, involving late sowing, followed 

 by drought and hot weather. The attack began in May and continued 

 throughout the summer. Attacks of Chloroj^s taeniojnis were observed 

 during June and July. Trachea {Hadena) secalis was comparatively 

 scarce, but occurred as usual in May in the oatfields. Contarinia 

 tritici was scarce, but G. aurantiaca was present in the usual numbers. 

 Limoilirifs denticornis was common in the rye fields in May and June, 

 but, with a few exceptions, no serious damage was noticed. AntJio- 

 tlirips aculeatus has been observed in some localities in rye, and thrips 

 were common as usual in oatfields. At Aarhus, Eurydema {Strachia) 

 oleraceum did some damage to barley and oats in June and July. 

 A])his avenae and Siphono'phora cerealis caused great injury in some 

 places at the end of July and the beginning of August. At Askov, 

 an attack, probably of S. cerealis, was noticed in August. At Aarslev 

 and Tune, some damage was caused by Tarsonemus spirifex. 



Pests of leguminous plants included Sitones lineatus on peas at the 

 end of March and in April. In July, in some localities peas were 

 attacked by Sijihonojjhora pisi and Kakofhrips (Physajms) rohustus. 

 In June, horse-beans were injured by Ap)his rumicis (papaveris), and 

 attacks of Ch-apholitha spp. on peas were fairly common in July, but 

 not to the same extent as in 1913. At Holstebro, the larvae of Tipula 

 pcdudosa injured peas. 



Pests of beet-roots and sugar-beets included Silpha opaca, which 

 comj)letely destroyed several fields, and at the end of June the larvae 

 of Hydroecia 7nicacea. Aphis rumicis appeared comparatively early 

 in 1914, attacks on seed beets being reported at the beginning of 

 June. On turnips and swedes, Chorfophila {Anfhomyia) brassicae, 

 especially in June, before and after the thinning of the plants, did some 

 injury, although generally speaking less than in 1913. At the same 

 time at the Experiment (Station a very serious attack of Ceuthorrhynchus 

 quadridens took place, while Phyllotreta nemoruni and P. atra were 

 very destructive in many localities. All over the country, Plutella 

 macidipe^mis {cruciferarum) was very numerous throughout the summer 

 just as in 1905. In that year, however, the attack lasted only a 

 comparatively short time, whereas in 1914 several generations injured 

 the turnips until the end of August and the beginning of September, 

 when Entomophtliora radicayis made its appearance and killed the 

 remaining larvae. Spraying with Paris green or nicotine was effective 

 against this pest. Aphis brassicae was fairly common during August 



