New York Agricultural Experiment Station. 33 



The value of tar pads, or hexagonal tar-paper collars, for the 

 purpose of preventing the adult of the cabbage maggot from placing 

 eggs about the stems of the plants has been previously demonstrated, 

 but, in spite of its effectiveness, this method of protecting cabbage 

 has not been generally adopted by truck growers. The tests herein 

 described show that tar pads will protect early cabbage from the 

 pest at a cost of about $1.40 per thousand plants. Truck growers 

 who are subject to losses by the cabbage maggot are urged to test 

 the tar pads experimentally as a basis for more extensive operations 

 against this pest. 



Susceptibility to spraying mixtures of hibernating pear psylla adults 

 and their eggs. — Bulletin No. 387 deals with investigations on the 

 pear psylla to ascertain the susceptibilities of the hibernating adults 

 and their eggs to spray mixtures. Studies of the seasonal history 

 and habits of the insect showed that this pest passes the winter as 

 an adult, or " fly ", and that the creature deposits its eggs in the 

 spring within a short period after its emergence from hibernating 

 quarters. 



The practice of clean culture and the removal and destruction of 

 rough bark left the flies with few opportunities of escape from appli- 

 cations of contact mixtures. The best means of killing the flies is 

 spraying during a period of warm weather, preferably in November 

 or December, or during March or early in April. The most satis- 

 factory mixture, from the standpoints of safety to fruit and leaf buds 

 and effectiveness against the insect is three-fourths of a pint of to- 

 bacco extract (40 per ct. nicotine) in 100 gallons of water to which 

 are added from three to five pounds of dissolved soap. 



Eggs about to hatch and newly emerged nymphs proved also very 

 vulnerable to an application of the lime-sulphur solution. By post- 

 poning the dormant treatment for the San Jose scale until the blossom 

 cluster-buds are beginning to separate at the tips, very effective 

 work can be done against the eggs. The lime-sulphur should be used 

 in the proportion of one gallon of the concentrate, 32° B., to eight 

 gallons of water. 



Tree crickets injurious to orchard and garden fruits. — Bulletin No. 

 388 is a report of studies on various tree crickets, in which attention 

 is directed especially to the more common and injurious species in 

 plantings of garden and tree fruits in the State of New York. One 

 of the most important forms is the snowy tree cricket ((Ecanthus 

 3 



