AND PREDATORS OF MEXICAN BEAN BEETLE 



9 



I adults. This bug consumed, on an average, 2.68 

 -ae, 0.54 fourth-instar larva, 0.67 pupa, and 0.89 adult 



bug Sinea diadema was observed feeding on larvae 

 rmingham, Ala., and on adult bean beetles at Colum- 



not of much importance in the control of this insect. 

 oho r ago 

 nost effi- 

 the most 



e penta- / 



rig t h e \ ( / 



Mexico 

 l part of 

 es. This 

 s also 



Central, 

 ic, and 

 tates, but 



in these 

 e of the 

 :*e more 

 I in the 

 3 other 

 ost. In 



was observed that the mortality among nymphs 

 was greatest where only bean beetle eggs were sup- 

 ine length of the developmental stages of this preda- 

 age number of hosts eaten per day in the insectary at 

 a., are summarized in table 7. 



Figure 2.- 



-IStirtlru-s anchorago feeding cm a pupa oi 

 the Mexican bean beetle. X4. 







development and feeding of Stiretrus anchorago ichen given 

 an beetle eggs, larvae, and pupae for food 





Time 



in 

 stage 



Average hosts eaten per day 





Eggs 



First 

 insta-r 



Second 

 instar 



Third 

 instar 



Fourth 

 instar 



Pupa 





Days 

 7-8 

 2-3 

 2-4 

 3-5 

 4-5 

 7 



Number 



Number 



Number 



Number 



Number 



Number 



















2.59 

 2.92 

 3.80 

 5.62 



■ 16. 67 



1.55 

 1.75 

 2.28 

 3.37 



10. 00 



0.78 

 .81 

 1.13 

 1.69 

 5.00 



0.39 



.44 



.57 



.84 



2.50 



0.08 



.09 



' .11 



.17 

 .50 



0.10 



.11 

 .14 

 .21 

 .63 









liventris (fig. 3) is usually abundant in the area of 

 tation east of the Mississippi River. Some investiga- 

 i preying upon all stages of the bean beetle while 

 ittacks to the larval and pupal stages. During the 

 : and 1935 efforts to rear nymphs of P. maculiventris 



instar (first carnivorous stage) on eggs of the bean 

 ccessful. Large nymphs and adult bugs fed on bean 



slight extent. Last, or fifth-instar nymphs, reared 



it mncntnorl rmo Iqtttp -fmi rf It -in ^tu t larva nv n minn 



llM 



