293 



Zappe (M. p.). Tests of Soap Sprays to kill the Pink and Green Potato 



Aphid [Macrosiphnm solanifolii, Ashmead). — Conn. Agric. Expt. 

 Sta., New Haven, Bull. 226, 1921, pp. 182-183. 



Macrosiphum solanifolii, Ashm. (pink and green potato aphis) 

 has been rather numerous and injurious around New Haven for the 

 last three or four years. Owing to the high cost of nicotine solution, 

 potato fields were sprayed in 1920 with water containing only soft soap 

 of a kind used for washing automobiles. This soap was made with a 

 basis of linseed oil and contained only 56-2 per cent, water. Used 

 at the rate of h oz. per U.S. gal. of water, it killed all Aphids on dipped 

 potato plants, and gave very good results in sprayed fields. 



Garman (P.). The European Red Mite, a new Orchard Pest in 

 Connecticut [Paratetranvchus pilosus, Can. & Fanz.). — Conn. 

 Agyic. Expt. Sta., New Haven, Bull. 226, 1921, pp. 184-189, 

 1 fig- 

 Apple orchards in Connecticut were found in early July 1920 to 

 be badly infested with Paratetranvchus pilosns (European red mite), 

 which has apparently been present in Connecticut for at least three 

 years. The winter is passed in the egg-stage on the twigs, generallv 

 in bud-scars or in crevices in the bark, or in the calyx cavity of apples. 

 Hatching cccurs in the spring, the greatest development taking place 

 between May and x\ugust, and the chief damage being done in June. 

 All stages may be found on the leaves at the same time. The stages 

 are described. The results of infestation are partial defoliation and a 

 reduction in the size of the fruit. An investigation into the sprays 

 used showed that the delayed dormant spray is important as a remedy 

 for the mite and should not be diluted more than 1 : 9 in the case 

 of lime-sulphur. The usual treatments for red spiders, such as sulphur 

 dust, lime-sulphur 1 : 50, kerosene emulsion and scalecide, might be 

 used with advantage. In Oregon a combination of nicotine sulphate 

 and lime-sulphur or scalecide has been found very effective. It is 

 thought that the eggs are not killed by winter-strength lime-sulphur, 

 but observations on the citrus mite indicate that the continued action 

 finally kills a large percentage of the mites after hatching. Tables 

 show the results of tests with various insecticides. 



Heinrich (C). Some Lepidoptera hkely to be confused with the 

 Pink Bollworra.— //. Agric. Res., Washington, B.C., xx, no. 11, 

 1st March 1921, pp. 807-836, 17 plates. 



The characters by which the larva and pupa of Platyedra {Pectino- 

 phora) gossypiella, Saund., may be distinguished from'those of other 

 Lepidoptera attacking cotton or related malvaceous plants, as well 

 as those feeding on other plants in the vicinity of cotton fields, are 

 described. A key to the larval characters is also given. The 38 

 species dealt with include the Stenomid, Aedemoses hesitans, Wlsm., 

 on Mexican ebony {Siderocarpiis flexicaidis) ; the Olethreutid, 

 Crocidoserna plebeiana, Z., on Malvastrmn spicatiim, hollyhock ( Althaea 

 rosea), Malvaviscns dntmmondi, okra {Hibiscus esculent us), in seed pods 

 of H. militaris and in flowers of H. rosa-sinensis ; the Pyralid, Glyphodes 

 Pyloalis, Wlk., on leaves of a mulberry tree, all of which are recorded 

 for the first time from the United States ; and a L^xaenid, Stryrnon 

 melinus, Hb., which feeds on practically all the Malvaceae. 



