11.   The main effect is seen during the prepatent phase, when the larvae are in the mucosa.

12.   Apply Bt as soon as there are young larvae actively feeding on the tree or shrub, which will be before the tents become large.

13.   Both dobsonfly and stonefly larvae are very sensitive to pollution, and can only be found in very good quality water.

14.   Eastern tent caterpillar larvae are active and vulnerable in early May, when the redbud and saucer magnolias are in bloom.

15.   Great spangled fritillary larvae are host-specific and feed only on violets.

16.   Huggins said that in general, odonate larvae are able to resist the toxic effects of most pesticides and heavy metals.

17.   If larvae are present, in three to four days some will rise to the potato and tunnel up inside it.

18.   If the larvae are numerous enough, or there are other stresses, the tree can die.

19.   Ladybug larvae are voracious, and make short work of aphids and other garden pests.

20.   More serious infestations should be treated when the larvae are small and most vulnerable.

n. + be >>共 1635
problem 0.82%
people 0.79%
company 0.71%
result 0.67%
thing 0.63%
report 0.57%
question 0.56%
official 0.55%
time 0.53%
issue 0.48%
larva 0%
larva + v. >>共 68
be 18.33%
eat 6.67%
hatch 5.56%
feed 5.00%
bore 2.22%
kill 2.22%
emerge 2.22%
grow 2.22%
survive 2.22%
spin 2.22%
每页显示:    共 33