Michigan State University Extension
Ornamental Plants plus Version 2.0 - 00000670
01/01/98

GLADIOLUS INSECT PROBLEMS

Aphids can be controlled with various dusts or sprays.      

Thrips rasp the outer tissue layers of the leaves, flowers  
and corms.  The infested surfaces are glistening, whitish   
gray.  Young insects feed in the sheath.  Infested flowers  
are discolored and spotted.  The leaves turn brown and dry  
out.                                                        

The tulip bulb aphid is common in sandy soil.  Infested     
corms develop stunted and deformed plants if at all.        
Shoots usually wither and die.                              

Tarnished plant bug causes flower bud blast or abnormal     
development.                                                

Wireworms bore holes in the neck or base of the leaves and  
flower stalks.  The shoots turn yellow and become deformed  
and stunted.                                                

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