-122- 



egg batches showed three hatching peaks, the first after 8 to 10 days, 

 the second after 30 to 60 days, and the third after about 160 days. 

 Figure 3-11 shows the development of 33 diapausing egg batches from 

 time of oviposition to adult emergence. Adults of the overwintering 

 generations emerged from late May to early July during 1983 and from 

 late March to mid July in 1984. The commencement of the 1984 

 emergence was approximately one month earlier than the first 

 appearance of adult _Lu. diabol ica in light trap collections from the 

 D'Hanis, Texas, study site (1 May, 1984). 



Quiescent 3rd and 4th stage larvae were observed in cultures, 

 usually associated with adverse conditions, such as excessive 

 moisture, extreme temperatures, or poor diet. These larvae continued 

 to feed and move about rather sluggishly for as long as three or four 

 weeks without any apparent development. Addition of fresh diet 

 usually, but not always, resulted in resumption of development and 

 pupation occurred within a few days. Some larvae lingered in their 

 quiescent state for a few more weeks and then resumed development 

 spontaneously, in the absence of apparent stimuli. Others never 

 resumed development and perished after several weeks. 



In the outside colony, eggs deposited in July hatched within 10 

 days, but larval development was arrested for long periods, presumably 

 due to hot summer temperatures (lows, 22°C; highs, 36°C). During the 

 quiescent period, food and moisture were replenished periodically and 

 the larvae continued to feed but did not resume development for 

 weeks, sometimes months. One batch of eggs was laid on 10 July 1983 by 

 a female that had emerged from a batch laid 20 October 1982. The eggs 

 hatched 20 July 1983, but the larvae did not pupate until 2 November 



