| AFFECTING LEAVES AND VINES: |
|
CONDITION
|
CAUSE
|
 |
Plants
wilt, foliage looks burned; preceded by pale green areas forming on
leaves |
Squash bug (Anasa
tristus)
|
|
Runner
or part of a runner wilts suddenly |
Squash vine borer (Melitta
satyriniformis)
|
|
Leaves
wilt, yellow, and curl |
Aphids (various)
|
|
Vines
wilt and die gradually, starting with newer leaves; no leaf yellowing
is present |
Bacterial wilt (Erwinia
tracheiphila)
|
|
Leaf
holes on young plants |
Striped and spotted Cucumber beetles (Acalymma
vittata)
|
|
Yellow
spots on leaves with mottling, distortion and wrinkling of older leaves |
Mosaic viruses
|
|
Leaves
are yellow and puckered and become bronzed |
Mites
|
|
Older
leaves mottled yellow between veins |
Downy mildew (Peronospora
effusa)
|
|
Leaf
spots that begin as water-soaked, then turn gray, die and drop out
leaving foliage with a shot-hole appearance |
Angular leafspot (Pseudomonas
syringae)
|
|
Dark
brown spots with concentric rings on older leaves first; vines
defoliate eventually |
Alternaria leaf
blight (Alternaria spp.)
|
|
Spots
with pale, round centers and dark margins on upper surface of leaves |
Cercospora leaf spot
(Cercospora spp.)
|
|
| AFFECTING FRUIT: |
|
CONDITION
|
CAUSE
|
|
Small
fruit spots turn white |
Angular leafspot (Pseudomonas
syringae)
|
|
Brown
and sunken spots |
Alternaria (Alternaria
spp.)
|
|
Misshapen
fruit |
Viruses, poor
pollination, or temperature extremes
|
