290 



Britton' {\V. K.). Twentieth Report o! the State Entomologist of 

 Connecticut for 1920.— Cojia. A^^yic. Expt. Sfa., Ncia Haven, 

 Bull. 226, 1921, pp. 137-215. 12 plates, 13 figs. [Received 16th 

 April 1921.] 



The inspection of nurseries and imported nursery stock during the 

 year is described. Pests intercepted on nursery stock include a bulb 

 mite on Manetti rose from Scotland ; Emphytus cinctus, L., on roses 

 from England, France and Holland ; and woolly aphis [Eriosoma 

 lanigentm] on apple from France. Apiary inspection v/as continued 

 on the same hues as in 1919 [R.A.E., A, viii, 338]. The incidence of 

 European foulbrood has decreased each year since inspection was 

 established, and American foulbrood was much less prevalent than in 

 1919. The statistics of the inspection of 1920 in 119 towns are shown, 

 arranged by counties. 



Extensive tests were made with dust mixtures in comparison with 

 liquid sprays, the general dust formulae consisting of 90 per cent, 

 powdered sulphur to 10 per cent, powdered lead arsenate, with the 

 addition of quantities of nicotine sulphate varying between | per cent, 

 and 3 per cent. The liquid spray consisted of one part liquid lime- 

 sulphur to 9 parts water, with | pint nicotine sulphate per 100 U.S. 

 gallons of liquid. The times and manner of the applications are 

 described. In discussing the results, it is pointed out that the tests 

 represent only one season's work in one locality, but it is not considered 

 advisable to discard spraying in favour of dusting, though apparently 

 chewing insects can be fairly satisfactorily controlled by the use of 

 ■dust. By adding nicotine sulphate to the dust certain sucking insects, 

 such as the false red bug [Lygidea mendax, Rent.), seem to be checked, 

 but the data are as yet too meagre to form conclusions. Nicotine 

 greatly increases the expense of the mixture ; dusting, on the other 

 hand, requires less time and labour. When sucking insects and scab 

 are troublesome, liquid spraying is considered preferable. 



An account is given of Hcmcropliila pari ana, Clerck (apple and 

 thorn skeletonizer), the information being based on facts previously 

 recorded. Agrilus sinuatits, 01. (sinuate pear-borer) continues to 

 infest all varieties of pear [R.A.E., A, iv, 446]. The hfe-history and 

 habits and the characteristic injury are described. It is suggested 

 that all trees that are so badly infested that their value is destroyed 

 should be cut and burnt. In more healthy trees the most severely 

 infested portions may be pruned off and burnt. The pupal chambers 

 of the beetle indicated by sunken and discoloured areas may be cut 

 open, and the insects destroyed. Lead arsenate sprays should be used 

 frequently during the latter half of May and June when the adults are 

 feeding on the leaves. Washes of lime-sulphur and lead arsenate 

 applied to the bark before the beetles emerge might act as a 

 repellent. 



As a precaution against the possible introduction of Pyransta 

 nnbilalis, Hb. (European corn-borer) into Connecticut, quarantine 

 measures have been passed restricting the importation of all parts or 

 products of maize or other food-plants of the borer without a certificate 

 from the Federal inspector. Both the stalk-borer, Papaipevia nebris, 

 Gn. {nitela, Gn.) and the corn ear worm, Heliothis obsoleta, F., are 

 abundant in Connecticut. Eriocampoides limacina, Retz. (pear and 

 cherry slug) appears in two generations, eggs of the first being laid in 

 mid-May, and of the second in July and August. It is this latter 

 .generation that is most injurious. Spraying with lead arsenate is 



