306 ANNUAL. REPORT OF THE Off. Doc. 



Hole Borer, and as this is in a tree that is already dead or dying, 

 we think it is more destructive than the facts warrant. If trees 

 are so declining as to be attacked by the Shot-Hole Borers, they 

 should be cut and burned, and thus prevent the spread of the pests 

 to other trees. 



Borers of fruit trees have been unusually active, but the fruit 

 growers have had another year to test the eflflciency of pure lin- 

 seed oil and white lead used a® paint, applied during the early 

 part of the summer to prevent such pests as well as later ravages 

 by rats and mice. We have seen thousands of apple trees so 

 painted and no injury has come. In fact we have tried it in our 

 own peach trees, and although this was done last summer, we can 

 not yet report injury, yet we still call attention to the fact that the 

 Beach-tree Borer is an insect that works lower in the ground, 

 and is not to be prevented by this method. Therefore it is scarcely 

 necessary to paint any but apple, pear and quince in order to pre- 

 vent the attacks of Borers. The Peach Twig Borer has occurred 

 in this State as a comparatively new pest. It is to be destroyed 

 by the regular formula for spraying with the lime-sulphur wash 

 for the San Jos6 Scale and at the same time of year as recom- 

 mended for this pest. The Borer in potato plants and m^ny other 

 forms of vegetation has proven quite destructire and has attracted 

 considerable attention. Since this lives chiefly in large weeds or 

 rn.shes, like bull weeds and artichokes, it is very important to 

 destroy these larger weeds by mowing them two or three times 

 during the summer. This pest can then be kept in check by thor 

 ough cultivation of plants and by burning as soon as they appear 

 to wilt from the effects of its infestation. 



The Cabbage Root Maggot has been unusually severe and has 

 destroyed much of the early planted cabbage as well as turnips 

 and radishes. Our experiments have proven that it is best to pre- 

 vent this by putting a band or disk of tarred paper around the 

 plant at the time it is set. These can be cut very rapidly with a 

 punch somewhat like a wad cutter for gun wads. They should be 

 nearly ten inches in diameter and slit in the centre to let the.ra be 

 passed around the plant. If plants be not thus protected and later 

 be infested with the Rootworm, this pest can be killed by treating 

 with carbolic emulsion as discussed in the Monthly Bulletin of 

 the Economic Zoologist for March, 1907. Fortunately, the late 

 cabbage is not infested with this pest as much as is the early 

 planted, and therefore, it is recommended to plant late that which 

 is needed for the winter supply and for making sourkraut and the 

 ( hief family use of the year. 



Tlie Green Worm or Larvre of the White Butterfly has not been 

 Imown to be so devstructive during the past year for the reason that 

 the .more extensive gardeners and truckers have now learned to 

 control it by simply spraying with arsenate of lead or Paris 

 Green applied at any time when the pests are present and before 

 the heads are three-fourths grown. Also dusting with Flour and 

 Paris Green while the leaves are damp with dew will prove effec 

 tlve. Use one part of Paris Green to forty parts of Flour. We 

 know where poisons have been used on cabbage for this pest for 

 j'ears without evil results. 



