218 



or powder, 1 lb. and | lb. respectively, to 25 U.S. gals, of water, or ^Ib 

 of Paris green, h lb. of freshly slaked lime and 25 U.S. gals, of water, 

 have been used with success against this pest. The spray should be 

 applied as soon as the leaves begin to unfold. Should the second 

 generation become destructive, hellebore should be used either as a 

 spray- 1 oz. to 1 U.S. gal. of water, or as a dust — -1 oz. to 5 oz. of 

 air-slaked lime or flour. 



There are two generations of Tortrix (Archips) rosaceana, Harr., 

 during the year. The caterpillars of the first brood appear during June 

 and July and the second from July to September. Eggs are laid in 

 a mass on the canes or leaves of the plant. Hibernation occurs in 

 this stage. The caterpillars form nests by rolling up the leaves. 

 Remedial measures include handpicking and spraying with lead 

 arsenate at the rate of 1| lb. of paste to 25 U.S. gals, of water. The 

 spray should be applied as soon as the leaves expand and be repeated 

 at the end of a week. 



Several generations of Tetranychus telarius, L., occur on currants 

 and gooseberries during the year. The eggs hatch in from 3 to 10 days, 

 development being retarded in cool and rainy weather. The larvae 

 give rise in about 3 days to the adult mites. They may be controlled 

 by spraying with flour paste or dusting with powdered sulphur either 

 alone or mixed with air-slaked Hme. Other effective sprays are 

 1 lb. powdered sulphur, 2 oz. soap and 3 U.S. gals, of water, or Black- 

 leaf 40 1 part to 1,000 parts of water with the addition of soap 

 at the rate of I lb. to 5 U.S. gals, of Black-leaf 40. 



The caterpillars of GymafopJiora ribearia, Fitch (currant span- 

 worm) hatch in late May or early June and feed for about 3 weeks 

 on the leaves. They enter the ground for pupation, which lasts 2 or 

 3 weeks. Hibernation occurs in the egg-stage. This moth may be 

 controlled by spraying with lead arsenate or Paris green as for Pteronus 

 ribesii. 



The paper concludes with a summary of treatment for pests and 

 diseases attacking currant and gooseberry plants. 



MozNETTE (G. F.). Annotated List of the Injurious and Beneficial 

 Insects of the Avocado in Florida. — Florida Bugqist, Gainesville, 

 iii, no. 3, December 1919, pp. 45-48. [Received 27th March 1920.] 



In addition to the insect pests of avocado recently recorded \R.A.E., 

 A, vii, ] 98, 240] the author gives notes on the following : Trialeurodes 

 Jioridensis, Quaint, (avocado whitefly), which is particularly abundant 

 about the coast, and multipUes rapidly during the summer months, 

 causing sooty mould ; Tetranychus yothersi, McG. (avocado red spider), 

 which also attacks camphor in the northern part of Florida, and lives 

 on the upper surface of the fohage of avocado, causing yellowing and 

 browning of the leaves ; the scales, Chrysomphalus diciyospermi, Morg., 

 Saissetia oleae, Bern., Pseudococcus nipae, Mask, (coconut mealy-bug), 

 and Pidvinaria pyriformis, Ckll. A thrips, Frankliniella cephalica 

 var. masoni, Wats., oviposits on the pedicel of the flower-clusters, 

 causing the cluster to drop. Eynpoasca minuenda, Ball (avocado 

 leaf-hopper) attacks the lower leaf surface during the growing season, 

 causing white spots to appear on the fohage. A species of Gracilaria 

 near G. violacella, Clem., is a small moth found wherever avocados are 



