282 THE MONTHLY BULLETIN. 



The Orange Thrips. 



The adult orange thrips is a small, orange yellow sucking insect, about 

 1-30 inch in length. Injury to citrus trees and the fruit is caused by 

 the feeding thrips in both the larval and adult stages. The character- 

 istic marking of the fruit is started when the fruit is small; continued 

 feeding of the thrips results in marking practically the entire surface 

 of the fruit. If the fruit is badly scarred while still small it ceases 

 growing and falls from the trees. According to Jones and Horton — 

 Bulletin 99, Part I of the Federal Bureau of Entomology— there are 

 from 8 to 10 broods a year. 



The distribution of the citrus thrips is limited in California to the 

 San Joaquin Valley and the Southern California orange ])elt. 



Four applications of spray may be necessary in order to control this 

 pest, the first being applied just after most of the petals have fallen, 

 the second 10 to 14 days after the first, and the third 3 to 4 weeks 

 after the second. If the" thrips are not abundant, however, the number 

 of applications will vary aeordingiy. 



In spraying two formuhp have been used, one, lime-sulphur. 33° 

 Baume, I'to 75, "Black Leaf 40." 1 to 1800; second, lime-sulphur, 

 36° Baume, 1 to 86, "Black Leaf 40," 1 to 1800. A. W. Morrill, in the 

 report of the Arizona Entomologist for 1911, states that he obtained as 

 good results M'ith lime-sulphur, 36° Baume, diluted in the proportions 

 of 1 to 85, as with the tobacco solution combined with the lime-sulphur. 



In spraying it should be remembered that only those thrips which 

 are actually hit witli the spray will be killed. Use angle nozzles, so that 

 all parts of the foliage will be drenched with the spray; maintain a 

 pressure of from 180 to 200 pounds. 



Should the reader care to go more deeply into the su])ject Bulletin 99, 

 Part I, of the Bureau of Entomology, U. S. Department of Agriculture, 

 contains much valuable information on this insect. 



MISCELLANEOUS INSECTS. 



Grasshoppers. 



At this time of the year grasshoppers are important pests in young 

 orchards. The following bran mash formula, recommended by the 

 Kansas Experiment Station, has been used successfully in California: 



Bran 50 pounds 



Taris green 3 pounds 



Lemons 10 fruits 



Svrup - 3 quarts 



Water 5 gallons 



Tile method of i)reparatioii is to mix the bran and Paris green thor- 

 oughly while dry; squeeze the juice of the lemons into the 5 gallons 

 of water, chop the remaining pulp and peel to fine bits, and add to the 

 water; dis.solve the syrup in the water, wet the bran and pour in with 

 the mixture, stirring at the same time, in order to thoroughly dampen 

 the mash. Scatter this poison ])ait about the trees while moist. 



