486 



The Destructive Insects and Pests Order of 1921. — Statutory Rules and 

 Orders, 1921, no. 931, H.M. Stationery Office, London, 3\st May 

 1921, 5 pp. 



By an Order which is to come into force on 1st October 1921 the 

 landing in England or Wales of all living plants with a persistent 

 woody stem above ground, and parts of the same, except seeds, when 

 for use in propagation — such as fruit-trees, stocks and stools, forest 

 trees, ornament^ shrubs and grafts, layers and cuttings thereof ; 

 all potatoes, tubers, bulbs, rhizomes, corms and hop stocks for planting ; 

 seeds of onions and of leeks for sowing, and gooseberries- — from any 

 country other than Scotland, Ireland and the Channel Islands, is 

 prohibited unless each package is accompanied by a certificate from 

 the exporting country or authorised by a hcence from the Ministry 

 of Agriculture. This Article shall not apply to consignments to the 

 Minister for experimental or scientific purposes. 



This Order also authorises the inspection of premises, and the occupier 

 may be required to adopt certain remedial measures within a prescribed 

 time should any of the following pests be found : — Phylloxera vastatrix. 

 Planch, (vine louse), Heterocordylus malinus, Rent., and Lygidea 

 mendax, Rent. (American apple tapsids), Stephanitis pyri, F. (pear 

 Tingid), Leptinotarsadecemlineata, Say (Colorado beetle), Conotrachelus 

 nenuphar, Hbst. (plum curculio), Phthorimaea operculella, Z. (potato 

 moth), Malacosoma americana, F., and M. disstria, Hb. (American 

 lackey moths), C\'dia molesta, Busck (oriental fruit moth), Aspidiotus 

 perniciosus, Comst. (San Jose scale), Diaspis pentagona, Targ. 

 (Japanese fruit scale), Rhagoletis pomonella, Walsh (apple fruit-fly), 

 R. cerasi, L., R. cingulata, Lw., and R. fausta, O.-S. (cherry fruit- 

 flies), Epochra canadensis, Lw. (gooseberry fruit-fly), and various 

 fungi. 



GouDE (H). Eradicating Gall Mite (Big Bud) Jrom Black Currant 



Stocks. — //. Minist. Agric, London, xxviii, no. 5, August 1921, 

 pp. 460-462, 2 figs. 



The propagation and distribution of " big bud " occurs every 

 year in all districts where black currants are cultivated, and the 

 question of raising clean stock is a serious one. The fact that bushes 

 obtained for planting are free from big bud is of little practical value, 

 unless they are also free from the mite [Eriophyes ribis] that causes 

 that condition. No stocks examined by the author during the past 

 17 years have been entirely free from the mite, big bud developing 

 as soon as they were subjected to the strain of faulty cultivation, 

 adverse weather or fruit-bearing. The plantation then becomes 

 unprofitable, and is usually uprooted. Clean bushes, even though 

 planted close to infected ones, generally remain free from the disease 

 for six or seven years, but as soon as mite or reversion occurs the plants 

 are uprooted, so that what should be the heaviest fruiting years — 

 the 5th, 6th and 7th — are lost. The condition known as reversion is 

 prevalent in most plantations, and many growers associate it with 

 the presence of the mite, but the fact that it has been observed in 

 seedlings proves that the mite is not the sole cause. It is probable 

 that any serious check to the growth of the plant, or a combination 

 of adverse circumstances, will start reversion. 



In order to raise clean bushes, a start should be made in April or 

 May, which is the only period of the j^ear when there are no mites in the 



