GRASSHOPPERS, AND OTHER INJURIOUS INSECTS 

 OF 1911 AND 1912. 



BY F. L. WASHBURN. 



GRASSHOPPERS. 



In the past two years special work has been done against these 

 pests of agriculture, four men being stationed in the field in 1911 

 and two in 1912. These men gave their entire attention to this sub- 

 ject. We were in part enabled to do this with a small special appro- 

 priation voted by the last legislature for this purpose, but the 

 money so provided was inadequate and we were obliged to use a 

 portion of our State fund to finish the work. The results of these 

 investigations and of practical application of same have been highly 

 gratifying and we feel fully warranted in making the following 

 statements. 



SUMMARY. 



1. The only thing that saved Minnesota from a plague of Grass- 

 hoppers in 1912 was an abundance of rain in May and early June, 

 which may have destroyed many insects directly after hatching, but 

 which, more especially, gave all crops (as well as weeds) a decided 

 stimulus. 



2. Given two or more successive dry seasons, and we will again 

 lose many thousands of dollars' worth of crops through the agency 

 of these insects unless farmers in infested districts take prompt and 

 co-operative action along the line of approved methods of control. 



3. We have found a successful control method in the following 

 poisonous spray: Sodium Arsenite 3 lbs., water 180 gallons, 



molasses 1^ gals.; or in smaller proportions. Sodium Arsenite 1 lb., 

 water 60 gals., molasses 2 quarts. The Sodium Arsenite should be 



EXPLANATION OF PLATE I. 



1. OrjihiiJeUa Sijeciusa; 2. The Differential Locust, Mela»(tj>Iiiif (liffcrfntialiK : 3. The 

 Sprinkled Locust, Chlnealtis (■onsppraa; 4. Chloealtis gJadstoni ; 5. The Clear-winged Locust 

 Camn\ila pellucida; 6. The Short-winged Locust, Slenobothrus ciirti iteniiis : 7. The Pale-green 

 Locust, HesperiUettix j'ratensis; 8. The Clouded Locust, EncopfolopliKs sordiihix: 9. I'liaetal- 

 iol/'K iit'bvdscenfist; 10. MelaiKiit/ iis iiiiimr. 



