514 STATE BOARD OF AGRICULTURE. 



Ten Days or Two Weeks Later^ it may be necessary to make an- 

 other spraying like the previous one for the rot and leaf spot. The need 

 for this spraying will depend upon the susceptibility of the variety to the 

 rot and the weather conditions of the season. 



Large Black Lice may appear on the leaves at any time. A spray- 

 ing of tobacco water (see page 16) will destroy them if applied before 

 the leaves curl too tightly. 



Slugs sometimes appear after the fruit is harvested, a spraying of 

 arsenate of lead (2 or 3 pounds in 50 gallons of water) will destroy 

 them. 



GENERAL TREATMENT FOR GRAPES. 



Grape vines are not often subject to attacks by scale insects so there 

 is seldom need for a spraying with strong lime-sulphur before growth 

 starts. 



Do not use the dilute lime-sulphur at any time for grape spraying. 

 It stunts or checks the growth of the berries. Use the Bordeaux mix- 

 ture. 



Grape black-rot has become a serious disease in the grape growing 

 regions of Michigan. Last year, it was not as serious as during several 

 years before. But growers who left a row unspraj-ed last year, found 

 enough rotten fruit to convince them that tlie spraying was necessary 

 and more than paid all the expenses connected with the work, 

 Whex the Shoots Are About 8 to 10 Inches Long, spray with Bord- 

 eaux mixture for black rot. 



Just Before Blooming, spray again wdth Bordeaux mixture for black 

 rot and to every 50 gallons of the Bordeaux, add 2 or 3 pounds of arse- 

 nate of lead to poison the grape berry moth and the rose-chafer. If this 

 latter is serious use stronger poison even up to 5 lbs. to 50 gallons. A 

 pint of the cheapest molasses added may help. 



Just As the Blossoms Are Falling^ make another spraying like the 

 above. 



AnouT 10 Days or Two Weeks Later, it may be necessary to make 

 another spraying like the two previous, but this Avill depend upon the 

 weather conditions and the amount of rot prevalent. If later sprayings 

 are thought to be necessary, some material should be used that will 

 not stain the fruit such as weak copper sulphate solution. (See page 

 173.) 



There are several grape insects that are found only in occasional vine- 

 yards and then not every year. The grower should keep a sharp watch 

 of his vines for them and if found, take prompt measures to destroy 

 them. (If not familiar with their appearance send specim,ens tj The 

 Entomologist, East Lansing, Michigan.) 



Those most likely to be found are the following: 



Flea-beetles may appear at any time but are most likely to come as 

 tlip buds open in early spring. Spray with Bordeaux mixture and a 

 strong poison, 3 or 4 pounds of arsenate of lead to every fifty gallons 

 of the Bordeaux; if early in spring. Later use less poison. 



In vineyards wliei-e the grape-berry moth is serious, spray with Bord- 

 cniix and an arsenical -poison during the middle of Jiilv, before the 

 2(Uh. 



